Preheat oven to 375°F. Spray a 9×13-inch pan (or two 8x8-inch pans) with cooking spray.

In large skillet over medium-high heat, saute onions until soft, about 4 minutes. Add garlic and stir for 1 minute but don’t let it burn. Next, add beef and sausage to the onion mixture and turn up the heat to medium-high. Cook until browned and no longer pink, breaking it up with a wooden spoon as it cooks. Drain off the grease, then stir in the sauce and remove from heat.

In the baking dish(es), spread a thin layer of the meat sauce into the bottom. Arrange a layer of half the ravioli over the sauce. Sprinkle about 1 cup of the mozzarella cheese and about 1 cup of the Italian cheese over the ravioli. Pour half of the remaining sauce over the cheese and spread it with the back of a spoon. Repeat layers, ending with the rest of the sauce on top. (Freezing instructions begin here.)

Cover tightly with aluminum foil. Bake for 45 minutes until hot throughout. Take foil off and bake about 15 minutes more or until bubbly at edges.

Let rest for about 10 minutes before slicing. Sprinkle with Parmesan cheese before serving.

Prepare the casserole through Step 3, but do not bake. Wrap the unbaked casserole(s) tightly with plastic wrap and foil before putting in the freezer, making sure to squeeze out any excess air.

Thaw in the fridge (may take up to 48 hours) or thaw in the microwave on defrost setting. Bake according to instructions, beginning with Step 6.

If cooking directly from frozen state, baking time will increase.