Meaty Pasta Casserole (Becki)

1 pkg. (16 oz) penne pasta
1 pound ground beef
1 pound bulk Italian pork sausage
1 3/4 cups sliced fresh mushrooms
1 medium onion, chopped
1 medium green pepper, chopped
2 cans (14 1/2 oz. each) Italian diced tomatoes
1 jar (25.6 oz) Italian sausage and garlic spaghetti sauce
1 jar (16 oz.) chunky mild salsa
1 pkg. (8 oz.) sliced pepperoni, chopped
1 cup (4 oz.) shredded Swiss cheese, divided
4 cups (16 oz.) shredded Mozzarella cheese, divided
1 1/2 cups shredded Parmesan cheese, divided
1 jar (26 oz.) three-cheese spaghetti sauce

Cook pasta according to package directions. Meanwhile, in a Dutch oven, cook the beef, sausage, mushroom, onion and green pepper over medium heat until meat is no longer pink; drain. Drain pasta; add to the meat mixture. Stir in the tomatoes, sausage and garlic spaghetti sauce, salsa and pepperoni. Divide half of pasta mixture between two greased 13-in. x 19-in. baking dishes. Sprinkle each with 1/4 cup Swiss cheese, 1 cup mozzarella cheese, and 1/3 cup Parmesan cheese. Spread 3/4 cup of three-cheese spaghetti sauce over each. Top with remaining pasta mixture and three-cheese spaghetti sauce. Sprinkle with remaining cheese. Cover one and freeze. Bake the other covered at 350 for 25 minutes. Uncover and bake about 10 minutes longer or until cheese is melted.