1 pound dry ziti or penne pasta
1 pound lean ground beef
1 onion, chopped
2 cloves of garlic, chopped
2 (26 ounce) jars spaghetti sauce (or equivalent homemade sauce)
1 1/2 cups sour cream
12 ounces mozzarella cheese, shredded
2 tablespoons grated Parmesan cheese
Preheat the oven to 350 degrees.
Bring a large pot of water to a boil. Add pasta, and cook about 8 minutes; drain.
In a large skillet, brown onion, garlic and ground beef over medium heat. Add spaghetti sauce, and simmer 15 minutes.
Butter or spray a 9×13 inch baking dish. Layer as follows: 1/2 of the pasta, 1/2 the mozzarella, all the sour cream, 1/2 sauce mixture, remaining ziti, remaining mozzarella cheese and remaining sauce mixture. Top with grated Parmesan cheese.
Bake for 30 minutes in the preheated oven, or until cheese is melted.