In large skillet, cook the beef, green pepper and onion over medium heat until meat is no longer pink; drain. Stir in tomato sauce, pizza sauce and tomato paste. In a 5-qt. slow cooker, layer pasta, beef mixture, pepperoni and cheese. Cover and cook on low for 3-4 hours or until heated through. Yield: 8 servings. If you?d like, substitute 1/2 pound bulk Italian sausage for the pepperoni in Pizza in a Pot. Cook it along with the ground beef, green pepper and onion.