This easy weeknight ravioli lasagna casserole is made with frozen or fresh ravioli and baked until bubbly and cheesy. A customizable family dinner ready in about an hour!
Heat the olive oil in a large skillet over medium heat. Brown the ground beef (or Italian sausage), breaking it up as it cooks, along with the onion and garlic. Once fully cooked, stir in the marinara sauce until well combined.
Stir in half of the Italian seasoning and the heavy cream. Taste and adjust the salt as needed, then set the sauce aside.
In a small bowl, mix the ricotta (or cottage cheese) with the remaining Italian seasoning, ½ cup of the Parmesan cheese, and kosher salt to taste. If using fresh basil, gently fold it into the mixture now, or save it for garnishing after baking.
Lightly grease a 9×13-inch baking dish. Start with a layer of the meat sauce, then add a layer of ravioli, followed by a layer of the ricotta mixture.
Add a layer of mozzarella cheese, then repeat the layers until everything is used. Finish by topping the lasagna with the remaining mozzarella and the remaining ½ cup of grated Parmesan cheese.
Cover and bake for 30 minutes. Remove the foil and bake for an additional 10 minutes, until bubbly. For a more golden top, place the lasagna under the broiler for 2–3 minutes at the end, watching closely.
Let the lasagna cool for about 10 minutes, serve, and enjoy!