Cook penne pasta according to package instructions. Drain and set aside.
Brown ground beef and sausage in a large skillet over medium heat. Remove grease.
Add cooked meat to a large mixing bowl. Add pepperoni, bell pepper, onion, parmesan cheese, oregano, garlic, mushroom and olives.
Add noodles and pasta sauce and toss to combine.
Pour mixture into a greased 9x13'' pan.
Sprinkle 1-2 cups of mozzarella cheese on top, (depending on how much cheese you want).
Bake at 350 degrees F for 25-30 minutes or until cheese is melted and bubbling.
*5-Minute Pizza SauceMake ahead instructions:Assemble the pizza casserole up until baking and store covered in the refrigerator for several hours. Remove from oven and bake as directed.Freezing instructions:Assemble casserole up until baking, adding it to a freezer safe casserole dish. Cover well with plastic wrap and tinfoil and freeze for up to 3 months. Thaw overnight in the refrigerator and bake as directed. (Optional: I like to add extra sauce when serving as the noodles will soak up some of the sauce as it freezes).