Pizza Casserole

Name: Pizza Casserole
Prep time: 25 min
Cook time: 50 min
Total time: 75 min
Yield: 8
Ingredients: Salt, for pasta cooking water; Cooking spray, for greasing the casserole dish; 16 ounces dry penne pasta; 8 ounces Italian sausage links; 1/2 red bell pepper, seeded and chopped; 1/2 green bell pepper, seeded and chopped; 1/2 small red onion, chopped; 4 ounces baby bella mushrooms, trimmed and sliced; 1/4 cup sliced black olives; 24 ounces (2 1/2 cups) store-bought or homemade marinara sauce; 1/2 cup grated Parmesan cheese; 1 teaspoon garlic powder; 1 teaspoon dried basil; 1 teaspoon dried oregano; 2 cups shredded mozzarella cheese; 4 ounces pepperoni slices