"A lady I worked with brought this in one day, and it was a hit. Now it is the favorite of all my dinner guests. It's great for a covered dish dinner too. I have made this also without the meat, and it is well received."

• 2 tablespoons grated Parmesan cheese
• 1 pound dry ziti pasta
• 6 ounces mozzarella cheese, shredded
• 1 1/2 cups sour cream
• 2 (26 ounce) jars spaghetti sauce
• 1 onion, chopped
• 1 pound lean ground beef
• 6 ounces provolone cheese, sliced