Preheat oven to 400°F and lightly grease a 3-quart oblong baking dish.
Place chicken breast halves in a single layer in the dish.
Lay one slice of cheese on top of each chicken breast.
Stir cream of chicken soup and milk until smooth, then spread over the cheese layer.
Place tomato slices on top of the soup layer.
Crush stuffing and mix with melted butter. Sprinkle evenly over the tomatoes.
Bake uncovered for 25 minutes, until chicken reaches 165°F and stuffing is golden. Serve with hot cooked rice.
Notes
Do not cover the casserole or the stuffing topping will steam instead of crisp. Tuck thin ends of chicken under if pieces are uneven. Crush the stuffing so it spreads evenly. Use a thermometer to confirm the thickest chicken piece reaches 165°F.