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Preheat Oven
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Set oven to 375°F (190°C).
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Lightly grease a baking dish (9×13 inch works well).
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Cook the Beef
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In a skillet over medium heat, cook the ground beef until browned.
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Add onion and cook until soft (about 3–4 minutes).
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Stir in garlic and cook for 30 seconds.
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Season the Filling
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Add taco seasoning and water, stirring well.
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Let it simmer for 3–5 minutes until slightly thickened.
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Mix in black beans and corn, then remove from heat.
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Assemble the Casserole
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Layer in this order:
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Spread a thin layer of enchilada sauce on the bottom.
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Add a layer of tortillas.
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Spoon over some beef mixture.
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Sprinkle with cheese.
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Repeat layers until everything is used, finishing with sauce and cheese on top.
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Bake
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Cover with foil and bake for 20 minutes.
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Remove foil and bake another 10–15 minutes until cheese is melted and bubbly.
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Rest & Serve
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Let the casserole rest for 5–10 minutes before slicing.
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Add your favorite toppings and serve warm.