Spoon a bit of the sauce into a 9x13 baking dish. Layer with tortillas (you might have to cut them in half to fit them into the dish) and sprinkle with cheese. Repeat until you've finished the sauce and tortillas. Top with a final layer of corn tortillas and a sprinkling of cheese.
Bake for about 25 minutes until warmed through and the cheese on top has melted and begun to brown. Remove from oven and allow to cool slightly before cutting and serving.