Layers of gooey mozzarella, rich creamy ricotta, spicy sausage, thick tomato sauce, and large, ridged rigatoni perfect for holding all that yummy sauce... baked to golden, bubbly perfection. Great for a potluck, family dinner, or make-ahead freezer meal!
Boil Pasta: Cook gluten-free rigatoni according to the package directions, but boiling two minutes less than instructed. The rigatoni should be al dente, as it will continue to cook and soften in the oven. Drain and set aside.
Cook Sausage: Meanwhile, brown ground sausage, onion, and garlic over medium heat. Reserving 1 cup of sauce (to coat the bottom of the baking dish), add the remaining sauce to the sausage mixture. Simmer on low for 15 minutes.
Preheat Oven: Preheat the oven to 350℉.
Prepare Baking Dish: While the oven preheats and the sauce simmers, spread one cup of marinara sauce on the bottom of a 9x13 baking dish. Set aside.
Combine Cheeses: In a bowl combine ricotta and all but ½ cup of the shredded mozzarella. (reserve ½ cup of mozzarella for the top of the baked rigatoni). Set aside.
Assemble Casserole: In the 9x13 baking dish, layer half of the rigatoni pasta, followed by half of the cheese mixture, then half of the sausage mixture. Repeat with a second layer of the remaining rigatoni, cheese mixture, and sausage mixture. Sprinkle the shredded parmesan and remaining shredded mozzarella on top.
Bake: Cover with foil and bake for 25 minutes. Remove foil and bake an additional 10 minutes. If you desire a burnt cheese top, place under the broiler for about 3-4 minutes.