Baked Ziti

1 pound dry ziti pasta
1 onion, chopped
1 lb lean ground beer
1 jar spaghetti sauce
1 can diced tomato with garlic/basil/onion
6 oz provolone cheese, sliced
1 1/2 cup sour cream
6 oz mozzarella cheese, shredded
2 tablespoons grated parmesan cheese

Bring a large pot of water to boil. Add Ziti pasta, cook until al dente.

Brown onion and ground beef. Drain any grease. Add spaghetti sauce and diced tomatoes. Simmer for 15 minutes.

Preheat oven to 350 degrees. Butter a 9 x 13 inch baking dish. Layer 1/2 of the ziti, provolone cheese, sour cream, 1/2 the sauce mixture, remaining ziti, mozzarella cheese, and remaining sauce mixture. Top with grated parmesan.

Bake for 30-40 minutes until the cheeses have melted together.