1 1/2 lbs ground beef
1 yellow onion, chopped
salt to taste
pepper to taste
1 lb rigatoni pasta, cooked according to package directions
1 green bell pepper, chopped
1 small can mushroom stems and pieces, drained
1 small pkg sliced pepperoni
10-oz mozzarella cheese
10-oz pkg cheddar cheese
2 cans (8-oz each) pizza sauce
Brown the ground beef with the onion, salt, and pepper until no longer pink; drain. In the crockpot (or slowcooker) put half the ground beef/onion mixture. Top with half the rigatoni, half the bell pepper, half the mushrooms, and half the pepperoni. Sprinkle the cheddar cheese over the pepperoni and pour 1 can of the pizza sauce over all.
Repeat layer with the remaining ground beef/onion mixture, remaining rigatoni, bell pepper, mushrooms then the sauce, remaining pepperoni and end with the mozzarella cheese.
Cook on low heat in the crockpot for at least 3 hours up to 5 hours or until the cheese is melted and casserole is bubbly.
Sprinkle with Parmesan cheese, if desired, when serving.