Rigatoni with Sausage

Ingredients (10)

• 12 ounces rigatoni
• 1 tablespoon olive oil
• 1 lb Italian sausage
• 1 small yellow onion,
• 3 cloves garlic,
• 3 cups marinara sauce
• 8 oz fresh mozzarella,
• 1/2 cup shredded Parmesan cheese
• Chopped fresh basil,
• Crushed red pepper flakes,