Baked Ziti

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 tbsp. grated Parmesan cheese

Preparation:

Bring a large pot of lightly salted water to a boil. Add ziti pasta, and cook until al dente, about 8 minutes; drain. In a large skillet, brown onion and ground beef over medium heat. Add spaghetti sauce, and simmer 15 minutes. Preheat the oven to 350ºF (175ºC). Butter a 9×13 inch baking dish. Layer as follows: ½ of the ziti, Provolone cheese, sour cream, ½ sauce mixture, remaining ziti, mozzarella cheese and remaining sauce mixture. Top with grated Parmesan cheese. Bake for 30 minutes in the preheated oven, or until cheeses are melted. Serves: 10.