Preheat oven to 350°
Spread a small amount of sauce on the bottom of a 9 X 13 baking dish
Spread out approximately 4 of the corn tortillas on top of the sauce. You may need to break some of the tortillas in half to make sure they thoroughly cover the dish
Sprinkle 1 cup of cheese on top of tortillas
Add another layer of tortillas and spread a small amount of sauce on top. Add another cup of cheese on top of sauce
Add one final layer of tortillas and top with the remaining sauce. There will be a lot of sauce but that's okay because it will cook into the casserole. Top with remaining cheese making sure the casserole is thoroughly covered in cheese
Bake for 30-45 minutes, or until cheese is brown and sauce is bubbly
Remove from oven and let sit for 10 minutes for easier slicing
Serve warm with sour cream (optional)
Enjoy!