This recipe is fantastic, with or without the meat. I have often cooked this for guests and they really enjoy it. I have been asked for this recipe from friends on several occasions. I usually add red and green peppers to it for coloring and it is wonderful.
- Bring a large pot of lightly salted water to a boil. Add ziti pasta, and cook until al dente, about 8 minutes; drain.
- In a large skillet, brown onion and ground beef over medium heat. Add spaghetti sauce, and simmer 15 minutes.
- Preheat the oven to 350 degrees F (175 degrees C). Butter a 9×13 inch baking dish. Layer as follows: 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 minutes in the preheated oven, or until cheeses are melted.