Baked Ziti

Name: Baked Ziti
Prep time: 15 min
Cook time: 45 min
Total time: 60 min
Yield: 10
Ingredients: Ingredients; 1 pound dry ziti pasta; 1 onion, chopped; 1 pound lean ground beef; 2 (26 ounce) jars spaghetti sauce; 6 ounces provolone cheese, sliced; 1 ½ cups sour cream; 6 ounces mozzarella cheese, shredded; 2 tablespoons grated Parmesan cheese