Step 1

Preheat the oven to 350 degrees Fahrenheit. Spray a 9x13 casserole dish with non-stick cooking spray and set aside.

Step 2

Cook ground beef and onion in a large skillet over medium heat until the meat is browned and the onions softens.

Step 3

Add minced garlic to the skillet and saute for 1-2 minutes longer.

Step 4

Add taco seasoning and water and stir over medium heat until well combined.

Step 5

Stir the tomatoes (juices included), green chiles, and black beans into the meat mixture and heat through.

Step 6

Line the prepared baking dish with 6 corn tortillas, overlapping slightly to cover the bottom of the casserole dish.

Step 7

Spread 1⁄3 of the meat mixture over the tortillas. Sprinkle 2 cups of the cheese over the meat mixture.

Step 8

Continue layering corn tortillas, meat mixture, and cheese to form three layers total.

Step 9

Cover with aluminum foil and bake for 30-40 minutes until casserole is bubbly and the cheese is fully melted.

Step 10

Garnish with diced tomatoes and green onion. Let the casserole sit for 10 minutes for easy slicing and serving.

Step 11

Serve with sour cream.