Baked Ziti

• • 1 lb dry ziti pasta
  • 1 onions, chopped
  • 1 lb lean ground beef
  • 2 (26 ounce) jars spaghetti sauce
  • 6 ounces provolone cheese, sliced
  • 1 1/2 cups sour cream or ricotta cheese
  • 6 ounces mozzarella cheese, shredded
  • 2 tablespoons grated parmesan cheese

Directions

1. Bring a large pot of lightly salted water to a boil; Add ziti pasta, and cook until al dente, about 8 minutes; drain.
2. In a large skillet, brown onion and ground beef over medium heat; Add spaghetti sauce, and simmer 15 minutes.
3. Preheat the oven to 350F (175C).
4. Butter a 9x13 inch baking dish.
5. 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.
6. Bake for 30 minutes in the preheated oven, or until cheeses are melted.