8. Preheat the oven to 375 degrees F.
9. Put the casserole on a baking sheet and bake until heated through and bubbly on top, about 40-50 minutes. The baking sheet will catch any drips of sauce or cheese.
10. Garnish the stacked enchilada casserole with raw red onion rings and serve.
You get more Make Ahead Casserole Recipes here. Recipe and photo courtesy of Food Network.com.
