Preheat the oven to 400°F (200°C) and lightly spray a 9×13-inch baking dish with cooking spray.
Bring a large pot of salted water to a boil and cook the rigatoni according to package directions until al dente; drain well.
In a large mixing bowl, combine the drained pasta and ricotta until evenly coated.
Add the frozen meatballs and the spaghetti sauce to the pasta-ricotta mixture and stir to combine.
Transfer the mixture to the prepared baking dish and sprinkle the grated Parmesan evenly over the top.
Spoon the Alfredo sauce over the casserole, then top with the shredded mozzarella cheese in an even layer.
Bake uncovered for 25–30 minutes, until the casserole is bubbly and the cheese is beginning to brown; remove and let stand a few minutes before serving.
Notes
This recipe uses frozen meatballs for convenience.
Ground beef meatballs are used, but turkey or chicken can be substituted.
Rao’s or Trader Joe’s Roasted Garlic Marinara are recommended store-bought options.
Optional add-ins include onions, bell peppers, diced tomatoes, mushrooms, baby spinach, or broccoli.
Add herbs like oregano, Italian seasoning, or fresh garlic to taste.
You can assemble ahead and refrigerate until ready to bake.