Baked ziti often has ricotta cheese. Instead of that, we're using sour cream and two cheeses, making it extra creamy.
1 lb. dry ziti pasta
1 onion, chopped
1 lb. lean ground beef
2 (26 oz.) jars spaghetti sauce
6 oz. provolone cheese, sliced
1 1/2 cups sour cream
6 oz. mozzarella cheese, shredded
1/4 cup grated Parmesan cheese
Preheat the oven to 350º.
Bring a large pot of lightly salted water to a boil. Add pasta, and cook about one minute shorter than package directions; drain.
In a large skillet, brown onion and ground beef over medium heat. Add spaghetti sauce, and simmer 15 minutes. Spray a a 9 x 13-inch baking dish with nonstick cooking spray. Layer as follows: half the ziti, half the sauce mixture, half the provolone cheese, half the sour cream and half the mozzarella. Repeat layers with remaining ingredients. Top with grated Parmesan cheese. Bake, covered, for 30 minutes, or until cheeses are melted.