Add the peanuts, white German chocolate baking bar, white chocolate chips, and white almond bark to the slow cooker.
Place a paper towel over the slow cooker insert, then set the lid on top.
Cook on low for 1 hour without lifting the lid.
After 1 hour, stir until the melted chocolate coats the peanuts evenly.
Replace the paper towel and lid.
Cook for 15 more minutes on low.
Stir again, then drop spoonfuls of the candy onto parchment paper.
Let the clusters cool completely until firm, about 2 to 3 hours depending on room temperature.
Notes
The paper towel helps catch condensation so water does not drip into the chocolate.Let the candy set completely before packing it into containers.Store the clusters in an airtight container at room temperature or in a cool room.