Crockpot Baked Spaghetti
The 4 o’clock witching hour is no joke. Everyone’s been gone all day, so when you walk through that door, opening it to that chorus of hungry, cranky voices is the last thing you want to do. Plus the last thing you want to do is stand over a stove. This is where my crockpot baked spaghetti comes to the rescue. Once you get home, dinner will be on the table in 20 minutes. Toss the ingredients into the crockpot in the morning, and when you get home, give it a stir and toss in the prepped pasta.
Quick note on the noodles: this recipe uses mostaccioli (tube-shaped pasta similar to penne) instead of spaghetti noodles. Mostaccioli will hold its shape a lot better in the slow cooker and won’t turn to mush. If you use spaghetti that’s fine, just keep an eye on it as thinner noodles cook quicker. Barilla mostaccioli is the one I reach for every time as it is readily available in most grocery stores and holds its shape throughout the entire cook.
Why This Casserole Works
- The sauce cooks for 3 hours before the pasta goes in. That long simmer in the slow cooker is what makes this taste like it spent all day on the stove. The flavors meld and deepen in a way that jarred sauce straight from the jar never does. By hour three, the sauce will be a deep, brick-red color and the whole house will smell like an Italian grandmother lives there.
- Chicken broth adds body and flavor. It thins the sauce just enough to cook the dry pasta at the end while adding a savory depth that plain water doesn’t give you. Water works in a pinch, but the broth is doing real work here — it’s essentially the pasta’s cooking liquid.
- Raw pasta goes in dry at the end. No boiling a separate pot of water, no draining, no strainer. The pasta soaks up the sauce as it cooks directly in the crockpot, picking up all that flavor as it hydrates.
- Mozzarella melts on top. Five minutes with the lid on at the end gives you a melted cheese layer that makes this feel like actual baked pasta without turning on the oven.
The Slow Cooker Method — What’s Actually Happening
Although pasta cooking directly in a slow cooker sounds unrealistic, it’s still possible — just with considerations. Here’s a look at what happens under the lid so you can make adjustments if things do go awry.
While cooking in the slow cooker for the first three hours, you will begin to build an elaborate sauce. The steam that is trapped in the slower cooker will not let the liquid reduce in the same way that it would reduce on the stovetop. But, don’t worry—the steam is integrating all of the flavors as well. The tomatoes that you diced will decompose and be part of the sauce with the rest of the ingredients. As for the herbs, they will be well incorporated as the result of the steam. The fat from the beef will mix with your tomatoes to create a gourmet sauce. Once you lift the lid, you will be greeted with a sauce that is thick and plump, and has a glossy appearance to it because of the richness of the sauce. If your sauce looks runny and is not rich in color at the three hour mark, let it cook for another half an hour before you begin to add your pasta.
When you put in the dry pasta, you’re using a technique called pasta-cooks-in-sauce that a lot of restaurant kitchens use. The pasta soaks up the starchy sauce instead of plain water so that every bite it coated in flavor from the inside. As the pasta cooks, the starches that it released thickens the sauce, which is why the finished dish cling together the way it does.
The main variable here is the temperature of your slow cooker, which can vary quite a bit, even between the same brand and model. Some slow cookers can easily get to a level where they are boiling the contents on HIGH, while others are very unlikely to even get to a simmer. This is especially important for the pasta step. If your slow cooker gets hot enough, your pasta could be done in half an hour. If it cools down more, you may need to wait 50 minutes. Start checking at that 30 minute mark and remove the pasta as soon as it becomes tender. You do not want to leave it in the slow cooker until it is falling apart, but you also do not want to take it out if it is crunchy in the center.
On slow cooker size: you want at least a 4-quart slow cooker, and a 6-quart gives you more breathing room if you double it. If you use a smaller pot, the sauce and broth, along with the tomatoes and pasta, will pack it so full you may run the risk of an overflow or uneven cooking.
What to Know Before You Start
You’ll need to do some active cooking to prepare the beef, which can take around 10 minutes, as you’ll need to brown the ground beef on the stove. You can do some beef preparation in the morning before you leave. The cooked meat can be stored in the fridge to be dumped when the slow cooker is started. Or you can brown the beef when you get back, prepare the sauce, and while you help with the homework and take a break, the cooker can do the 3-hour cook. Either way can work because the timing of the sauce is flexible.
Be sure to drain the fat after browning your meat. Ground beef at 80/20 will produce a lot of fat when cooked and leaving the fat in the sauce will make it greasy. To drain the fat you can tilt the pan and use a spoon to remove it or you can drain the meat into a colander that has some paper towels in it.
While adding the pasta, keep the lid on and set the heat to HIGH. For the pasta to cook, a consistent heat is essential. If your slow cooker drops to a simmer or you’re peeking frequently, the pasta will take longer to cook, and will cook unevenly. The pasta will be mushy on the outside, while the inside will be crunchy. Set a timer for 20 minutes and don’t check before then.
Ingredients
- 1 lb ground beef — 80/20 is ideal. The fat adds flavor during the brown, and you drain most of it off afterward.
- ½ yellow onion, finely chopped — Finely chopped is important here. You want the onion to essentially melt into the sauce during the three-hour cook, not have visible chunks in the finished dish.
- 1 tsp minced garlic (or ½ tsp garlic powder) — Both work. Fresh minced garlic gives a slightly brighter flavor; garlic powder is more mellow and convenient.
- 1 tsp dried basil
- 1 tsp dried parsley
- 1 can (28 oz) diced tomatoes — Use the whole can, juice and all. The juice is part of the cooking liquid that eventually cooks the pasta. Hunt’s or Muir Glen are both solid picks.
- 2½ cups pasta sauce (about a 650 mL jar) — This is where the quality of your jar sauce matters most. A good sauce makes a great finished dish; a bland sauce makes a bland dish. Rao’s Homemade marinara is the upgrade pick here — it’s thicker, richer, and tastes closer to homemade than anything else in the jarred sauce aisle. It’s more expensive, but you’ll taste it. A mid-range option like Newman’s Own or Prego Traditional also works well.
- 2½ cups chicken broth — Use regular sodium chicken broth (not low sodium) for the best flavor. The broth is doing two jobs: thinning the sauce enough that the dry pasta can cook in it, and adding a savory backbone that water can’t replicate. Swanson or Kitchen Basics are both good. In a pinch, beef broth works too — the flavor will be richer and slightly different, but still delicious.
- 3 cups mostaccioli pasta, dry (or penne) — Barilla mostaccioli is the easiest to find and holds up well. Penne rigate (the ridged version) also works and grips the sauce nicely. Avoid thin pasta shapes — spaghetti, angel hair, or vermicelli — they cook too fast and go mushy before the sauce has time to reduce properly around them.
- 1 cup shredded mozzarella cheese — Pre-shredded works fine. If you want more of a browned-top look (like actual baked pasta), you can transfer the finished pasta to an oven-safe dish and broil for 2–3 minutes instead of melting with the lid on.
How to Make It
Meat should be browned: In a skillet over medium-high heat, ground beef, diced onion, and raw garlic should be cooked until beef is finished and shows no traces of pink. This should take about 8-10 minutes. As this cooks, it should be broken into fine pieces. At this stage, the onion should be soft and the color of glass. Make sure to grease the skillet before cooking.
Make the sauce: Move the beef mixture to a slow cooker that is 4 quarts or larger. Add the canned tomatoes (including all the liquid), the pasta sauce, chicken broth, dried basil, and dried parsley. Give everything a stir until it’s combined. At this point it will appear thin and near soupy– that is fine. You intentionally have a lot of liquid in there.
Make the sauce: then cover and cook for 3 hours on HIGH. Lifting the lid will cause the cook time to increase 15-20 mins. So once you cover it, you can’t open it again for the whole cook time. Once the 3 hours are up, the sauce should be thick and deep brick red as well as not being as liquidy as it was when you started. It should smell amazing. When done, the diced tomatoes should be decomposed and merged into the sauce. Add the pasta if you think it needs to be cooked for an additional 30 minutes. If it still seems pale and liquidy, it’s time to cook it again.
Stir in the dry mostaccioli noodles and cover them as much as you can with the sauce. It’s okay if some noodles stay uncovered, they will get submerged when you stir them halfway through the cooking. Now put the lid back on and keep the heat on HIGH for the next 20 minutes. After 20 minutes, open the lid and stir everything up again. It helps to go from the bottom up (because the pasta tends to stick). Cover it again and leave it to cook for another 15-20 minutes. You want the pasta to be soft and not crunchy in the middle, so get in there and bite a piece to check. There should be almost no sauce left, but what is there should be thick and clingy to the pasta instead of downright watery sauce. If you think there is too much sauce, for the last 10 minutes of cooking, leave the lid close but slightly open to release some steam.
Add the cheese: Scatter the shredded mozzarella across the surface. Put the lid back on and leave on HIGH for another 5 minutes for the cheese to fully melt. Once you lift the lid, there should be a nice smooth, shiny layer of melted cheese with no white dry patches. Serve straight from the slow cooker right away.
Helpful Tips
- Mostaccioli vs. spaghetti noodles. Mostaccioli or penne is the better choice here — the tubular shape holds up to the long cook and stirring without falling apart. Barilla is easy to find and reliable. Thin spaghetti noodles can turn mushy quickly, so if you use them, start checking at 15 minutes and be ready to pull it fast.
- Don’t skip the stir at 20 minutes. The pasta on the bottom cooks faster and can stick to the sides and bottom of the slow cooker. Stirring at the halfway point redistributes everything, prevents sticking, and helps everything cook evenly. Use a wooden spoon or silicone spatula — metal can scratch the ceramic insert.
- The sauce will look thin when you add the pasta. That’s correct — the dry noodles need that liquid to cook. By the time the pasta is done, it will have absorbed the extra liquid and the sauce will be thick and clingy. If you think something went wrong at the pasta-adding stage, it probably didn’t. Wait it out.
- Every slow cooker is different. Some brands and models run significantly hotter than others. If you’ve made slow cooker pasta before and it turned out mushy, your slow cooker runs hot. Pull this 5–10 minutes earlier than the recipe says. If you’ve never made slow cooker pasta before, start checking at 30 minutes total and go from there.
- Serve with garlic bread. This is ideal for soaking up the extra sauce at the bottom of the bowl. Thick crusty bread works even better.
- Add a splash of liquid when reheating. The pasta keeps absorbing sauce as it sits, so leftovers will be thicker and drier than the day you made them. A few tablespoons of chicken broth or water stirred in before microwaving brings it right back.
Storage and Make-Ahead
Store leftovers for 4 days in an airtight container. While the sauce is absorb by the pasta you can add some broth or water when you reheat to loosen it up. You can reheat it in the microwave by intervals of 90 seconds and stir after each interval until it is hot all the way through.
Freezer: This item Freezes well. Make sure to let it cool completely before dividing into freezer-safe containers or zip-top bags. You can freeze for 2 months. To thaw, place in the fridge the night before, then warm on the stove or microwave with a splash of water or broth. There will be a slight change in texture, but the flavor will be on point.
You can prep the sauce in advance (without the pasta). It can be stored in the fridge for 3 days. To make it easier, you can put it in the slow cooker on HIGH for 45 minutes. Once it has heated up, add the pasta and continue from there. You can do weeknight meal prep. On Sunday, do the 3 hour sauce part, then do the pasta step on a weeknight, which is less than an hour.
Frequently Asked Questions
Can I use a different pasta shape?
Absolutely! Penne, rigatoni, ziti, and rotini, all work equally well. Any other short sturdy pasta that can withstand a bit of stirring will also work. Penne rigate works well as the ridges on the penne rigate help grip the sauce making for better flavor! It’s best to avoid angel hair or thin spaghetti as these cook far too quickly while in the slow cooker and will turn to mush before the sauce reduces.
Can I use Italian sausage instead of ground beef?
For sure! Italian sausage (whether hot or mild) works really well here; it adds tons of flavor with the fennel, herbs, and a little heat if you go with the hot variety. Brown it the same way as the ground beef after removing it from the casing. Some of my favorite versions are the ones that do a 50/50 mix of ground beef and Italian sausage.
My pasta came out mushy. What happened?
It’s either a problem with the slow cooker running hot or you cooked the pasta for too long. Keep in mind that all slow cookers are different. Some reach a full boiling point on high, while others barely simmer. If you noticed that your pasta became mushy, that means you slow cooker runs on the hotter side. It would be best to start checking for doneness at 25 minutes instead of 40, and pull when it’s just barely tender. Even after you turn off the slow cooker it will continue to cook from carryover heat. Also make sure you’re using a sturdy short pasta shape – thin noodles over cook in a fraction of the time.
My sauce is too thin after the pasta cooked. What do I do?
There are a few reasons this could happen. First, check that the pasta cooked long enough. If the pasta is undercooked, the pasta has not absorbed the liquid so the sauce will appear wet. Also, if the pasta is cooked, you can leave the lid slightly ajar for about 10–15 mins on steam high, some of steam will escape and the sauce will thicken. Additionally, you can mix in a tbs. of tomato paste for a quick fix.
The cheese isn’t melting properly. What’s wrong?
When cheese is shredded ahead of time, it’s coated in something to prevent sticking. Unfortunately, this can cause it to melt unevenly you’re better off shredding fresh cheese yourself. However, if you have to use pre-shredded cheese, just give the cheese more time to melt. When cheese is melting, it’s best to cover it, and let it sit for 5 minutes before checking it again. Since you’re working with block cheese, I recommend melting the cheese again yourself in the broiler. To do this, move the pasta to an oven-safe dish, and put it in the oven with cheese on top. Turn your oven to broil and let it sit for 2-3 minutes, watching it closely so it doesn’t burn. This will shake the cheese down and grease it up. That’s essentially what you’re doing when you make homemade baked pasta.
Can I add vegetables?
Yes! Bell peppers, mushrooms, or zucchini can be added to the sauce during the 3 hour cook. They’ll be completely soft and blended into the sauce by the time the pasta is added. If you prefer them to be a bit more crunchy, add them during the last 30 minutes of the sauce cook. You can also add in spinach or kale at the very end, right with the pasta.
Can I make this without browning the meat first?
Yes, it’s possible to add raw ground beef to a slow cooker, but I wouldn’t recommend doing it. Ground beef is safe to eat after cooking, but it will lack flavor because the beef hasn’t been browned. Beef that has been browned has a crust that creates a different flavor. However, that is not the only difference. When beef is browned, that’s also the time that the onion will soften and the garlic will bloom. You will see a big difference in the final meal. The browning only takes 10 minutes. It is worth the time.
What’s the best pasta sauce to use?
This depends on your priorities and budget. In short, the better the jarred sauce, the better the final meal. Rao’s Homemade Marinara is the best jarred sauce as San Marzano tomatoes, olive oil and no sugar added. It is the closest to scratch-made sauce. It also thickens nicely in the slow cooker. Newman’s Own, Prego Traditional, and Classico Tomato Basil are all good middle tier options. Stay away from thin or watery sauces as they make the meal more difficult to achieve the right consistency.
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