Baked Ziti

1 lb. dry ziti noodles, I use rigatoni
1 onion, chopped
1 lb. ground beef
2 jars spaghetti sauce
6 oz. provolone cheese, sliced
1 1/2 c. sour cream
6 oz. mozzarella cheese, shredded
2 T. grated parmesan cheese

Cook ziti 8 minutes until al dente. Drain and rinse. Brown onion and beef on medium heat. Add spaghetti sauce and simmer for 15 minutes. Grease a 9x13 dish and layer ziti, provolone cheese, sour cream 1/2 sauce mixture, ziti, mozzarella, and sauce mixture. Top with parmesan cheese. Bake at 350 degrees for 30 minutes.

Layers:
ziti
provolone cheese
sour cream
1/2 sauce mixture
ziti
mozzarella
sauce
parmesan cheese

**Half this recipe and it still makes a ton!!