Lynn's Recipes - Baked Ziti

Ingredients

• 1 pound of dry ziti pasta
• 1 onion, chopped
• 1 pound ground beef
• 2 (25.5 ounce) jars spaghetti sauce
• 6 ounces sliced provolone cheese
• 1-1/2 cups sour cream
• 6 ounces shredded mozzarella cheese
• 3 tablespoons grated Parmesan cheese