Step 1: Preheat your oven to 350°F and grease a 9×13 inch casserole dish with olive oil or cooking spray.

Step 2: Place 6 corn tortillas on the bottom of your dish, overlapping them slightly. Save the other 6 tortillas for the second layer.

Step 3: Warm the refried beans in the microwave for 30 seconds, then stir. This makes them easier to spread. Use a spoon to spread half the beans over the tortillas.

Step 4: Brown the ground beef in a large skillet and add the taco seasoning. Spread half of this seasoned beef over the beans in your casserole dish.

Step 5: In the same skillet, cook the onions and bell peppers with chili powder, cumin, and garlic powder for 3-4 minutes until they’re tender.

Step 6: Add the corn, cilantro, and green chilies to the skillet. Cook for another 2-3 minutes.

Step 7: Spread half the vegetable mixture over the beef layer, then pour half the enchilada sauce on top. Sprinkle 3/4 cup of cheese over everything.

Step 8: Repeat all the layers again – 6 more tortillas, remaining beans, remaining beef, remaining vegetables, remaining enchilada sauce, and remaining cheese.

Step 9: Bake for 30 minutes until the cheese melts completely and the casserole heats through.

Step 10: Let it cool for 5 minutes, then cut into 6-8 portions.