Pasta al Forno

Name: Pasta al Forno
Prep time: 40 min
Cook time: 30 min
Total time: 1 h 10 min
Cuisine: European, Mediterranean, Italian
Ingredients: 1 lb rigatoni pasta; 2 tablespoon olive oil; 1 yellow onion, diced; 3 cloves garlic, minced; 1 lb Italian sausage; 1 (1 lb) can tomato puree; 1 ½ teaspoons salt; 1 teaspoon black pepper; 1 teaspoon oregano; 2 1/2 cups shredded mozzarella cheese, divided; ½ cup parmesan cheese, shredded