Foryoueats: Pizza Casserole

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