16 oz pkg  Ziti Pasta
1 lb  Lean Ground Beef (extra lean is also good or a mix of beef and your favorite Italian sausage)
1  Onion, chopped
2 27 oz  Cans Spaghetti Sauce
1-1/2 C  Sour Cream
6 oz  Provolone Cheese, sliced
6 oz&bsp; Mozzarella Cheese, sliced
1/2 C&bsp; Parmesan Cheese, grated
2 tbs  Fresh Basil, chopped

Cook pasta as directed on the manufacturer's packaging and drain. While the pasta is cooking, saute the ground beef and chopped onion in a heavy skillet over medium heat. Add spaghetti sauce and simmer about 15 minutes. Place about half of the pasta in a lightly oiled 2-quart baking dish. Top with a layer of provolone and mozzarella cheeses. Spread on a layer of about half the spaghetti sauce mixture and the sour cream. Cover with the remaining pasta, cheese slices, and sauce. Finally, sprinkle on a layer of Parmesan cheese and fresh basil. Bake in a pre-heated 350F degree oven for about 30 minutes, or until the cheese and sauce are bubbly. Serve warm.