Preheat the oven to 350 F/176 C. Have ready an 8-inch square casserole dish.
Put about a half an inch of oil into a skillet and heat it to shimmeringh.
Open the can of enchilada sauce and pour a thin layer of it into the casserole dish.
Heat a tortilla in the pan until it has softened, about 10 seconds, then drain it on a piece of paper. Put a layer of tortillas on the bottom of the pan.
Mix together the cheese, onion, and jalapeno.
Put most the cheese mixture on top of the tortilla, and pour a little fo the sauce on the cheese mixture. Set the rest aside to top the casserole.
Top with the remaining tortillas.
Pour the rest of the sauce over the tortillas.
Top with the remaining cheese mixture.
Put the casserole in the oven and bake for about 30 minutes or until all the cheese has melted and the casserole is bubbling.
Serve with sour cream and your favorite hot sauce. Black beans prepared in the Instant Pot go well with this.
Notes
You can make your own enchilada sauce or you can use your favorite canned one. If you don't have red onions, although they add a bit of nice sweetness, you can use plain white or yellow onions instead. Feel free to use fresh jalapeno if you have it on hand.You can easily double this recipe for a larger pan and more people. Good eating!
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