Baked Ziti

From Julie's Blog

1 pound dry ziti pasta (we've also been known to use just about any kind of pasta)
1 onion, chopped
1 pound lean ground meat (we typically skip the meat or use turkey but beef works too)
2 (26 oz) jars of spaghetti sauce
6 oz Provolone cheese, sliced
1 1/2 cups sour cream
6 oz mozzarella cheese (yeah, I'm SURE we use more than that!)
2 TBSP grated Parmesan cheese (again, I'm sure we use more than that!)

Boil pasta to al dente, drain. Brown onion and ground meat. Add meat mixture to spaghetti sauce and simmer for 15 minutes.

Preheat oven to 350 degree. Grease a 9x13 baking dish. Layer as follows: 1/2 of the ziti, provolone cheese, sour cream, 1/2 of the sauce, ziti, mozzarella cheese and remaining sauce. Top with Parmesan cheese.

Bake for 30 minutes or until cheese are melted.