Baked Ziti

1 pound dry ziti pasta
1 pound ground beef
6 oz provolone cheese, sliced
6 oz mozzarella cheese, grated
1 onion, chopped
2 (26oz) jars spaghetti sauce
1 1/2 cups sour cream
2 TBSP grated Parmesan cheese

Bring a large pot of lightly salted water to a boil. Add ziti pasta, and cook until al dente, about 8 min; drain.
In a large skillet, brown onion and ground beef over medium heat, add spaghetti sauce, and simmer 15 min.
Preheat the oven to 350 degrees. Butter a 9x13 baking dish. Layer as follow: 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. Bake for 30 min.

I got this from one of my neighbors and we really liked it. It makes a lot!! You could easily half the recipe and still have plenty!