Baked Ziti

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.

Baked Ziti 
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

Instructions
 Step 1
Bring a large pot of lightly salted water to a boil. Add ziti pasta, and cook until al dente, about 8 minutes; drain.

 Step 2
In a large skillet, brown onion and ground beef over medium heat. Add spaghetti sauce, and simmer 15 minutes.

 Step 3
Preheat the oven to 350 degrees F (175 degrees C). Butter a 9x13 inch baking dish. Layer as follows: 1/2 of the ziti, Provolone cheese, sour cream, 1/2 sauce mixture, remaining ziti, mozzarella cheese and remaining sauce mixture. Top with grated Parmesan cheese.

 Step 4
Bake for 30 minutes in the preheated oven, or until cheeses are melted.

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