Step 1

Preheat the oven to 350 degrees F.

Step 2

Grease two 9x13-inch baking dishes.

Step 3

Cook the pasta according to the package directions.

Step 4

In a dutch oven over medium-high heat, cook the beef, sausage, mushrooms, onion, and green pepper, breaking the meat into crumbles, until the meat is no longer pink, about 5-7 minutes.

Step 5

Drain the fat from the dutch oven.

Step 6

Drain the pasta and add it to the meat mixture.

Step 7

Stir the tomatoes, the sausage and garlic spaghetti sauce, the salsa, and the pepperoni into the meat mixture.

Step 8

Divide the mixture between the prepared baking dishes.

Step 9

Sprinkle each dish with 1/4 of the Swiss cheese, 1 cup of mozzarella, and 1/3 cup of parmesan cheese.

Step 10

Evenly spread the 3-cheese spaghetti sauce on top of each of the casseroles.

Step 11

Sprinkle the remaining Swiss, mozzarella, and parmesan evenly over the top of both of the casseroles.

Step 12

Cover the casseroles and bake until bubbly, about 25 minutes.

Step 13

Uncover and bake until the cheese is melted, about 10 minutes.

Step 14

Serve hot.