Mom's Baked Rigatoni Pasta

Ingredients

• 2 teaspoons olive oil
• 1 pound 90% lean ground beef
• 1 pound mild Italian sausage, casings removed
• salt, to taste
• black pepper, to taste
• 1/2 cup onion, finely chopped
• 2 teaspoons garlic, minced
• 1 (24-ounce) jar marinara sauce
• 1 (8-ounce) can tomato sauce
• 16 ounces rigatoni pasta, cooked
• 2 cups mozzarella cheese, shredded
• 2 tablespoons parsley, finely chopped