I serve this with a crisp, green salad and some garlic bread sticks and call it Heaven.
Of course if you're inclined to make your own sauce, use that--the ziti will be even more delicious. See for yourself.

16 ounces dry ziti pasta
1 pound Italian sausage
15 ounces container ricotta cheese
1 egg
1 large white onion, minced
3 teaspoons minced garlic
1 teaspoon dried oregano
1/2 teaspoon salt
1/2 teaspoon ground black pepper
1 1/2 (26 ounce each) jars spaghetti sauce*, divided
8 ounces shredded Italian cheese blend
1 teaspoon dried basil
Preheat an oven to 350 degrees F. Grease a 9x13 inch baking dish.
Fill a large pot with lightly salted water and bring to a rolling boil over high heat. Once the water is boiling, stir in the ziti, and return to a boil.
Cook the pasta uncovered, stirring occasionally, until the pasta has cooked through, but is still firm to the bite, about 8 minutes. Drain well in a colander set in the sink.
While pasta is cooking, heat a large skillet over medium heat. Add the sausage, and cook and stir until brown, about 10 minutes. Drain sausage and set aside.
Stir together the ricotta, egg, onion, garlic, and oregano in a large bowl until well combined.
Stir in the drained pasta, the drained sausage, salt, pepper, and 1/2 jar of the spaghetti sauce; mix well.
In the prepared baking dish, cover the bottom with 1/3 jar of spaghetti sauce. Layer 1/2 of the pasta mixture, 1/3 jar of spaghetti sauce, and 1/2 of the shredded cheese.
Then layer the remaining 1/2 of the pasta, 1/3 of the sauce, and 1/2 of the cheese. Sprinkle with basil. Cover the dish tightly with aluminum foil.
Bake in the preheated oven until heated through, about 20 minutes. Uncover; return to the oven and bake until cheese is melted, 5 to 10 more minutes.
*You can use 40 oz. homemade sauce instead of the store-bought jar type.