Baked Ziti Recipe - Hungry Hoarder

Ingredients

• 1 pound ziti pasta dry
• 1 medium onion chopped
• 1 pound ground beef
• 2 jars (26 ounce) spaghetti sauce
• 1 cup mushrooms sliced
• 1/2 pound provolone cheese sliced
• 1 cup sour cream
• 1/2 cup cottage cheese small curd
• 2 cups mozzarella cheese shredded