Preheat oven to 180 degrees. Grease oven dish and cover with 1/3 of the tomato sauce. Add 1/2 of the ravioli to the sauce, top with 1/3 of the sauce and cover with 1/2 of the cheese. Layer the second half of the ravioli on top, the rest of the sauce and the rest of the cheese.
Cover the baking tin with aluminium foil and bake for 30 minutes. Then remove the aluminium foil and bake for another 15 minutes.