Baked Penne Casserole

Bahan-bahan (6 porsi)

• 12 ounces penne (cooked al dente)
• 1 pound prepared meatballs (or recipe below)
• 1 tablespoon olive oil
• 1 small onion (chopped)
• 2 cloves garlic (minced)
• 24 ounces marinara sauce (or pasta sauce)
• 14.5 ounces fire-roasted diced tomatoes (with juices)
• 1 tablespoon chopped fresh parsley (or 1 teaspoon dried)
• 1 cup shredded mozzarella cheese