Preheat the oven to 350°F (175°C). Lightly grease a 9x13-inch baking dish.
In a large skillet over medium-high heat, melt 2 tablespoons salted butter. Add 1 medium white onion (diced) and cook until softened and lightly browned, about 3-5 minutes. Add 1 1/2 pounds ground beef, 1 (7 ounce can) diced green chiles, 1 tablespoon ground cumin, 2 teaspoon salt, 2 teaspoons chili powder, and 2 teaspoons garlic powder. Cook until the beef is browned and fully cooked, about 6-8 minutes. Remove from heat.
In a medium skillet over medium heat, add ¼ to ½ teaspoon of olive oil. Working one at a time, brown 12 (6-inch) corn tortillasadding more oil for each tortilla, until lightly golden, about 1 minute per side. Once all are browned, cut them in half.
Arrange half of the tortilla halves in the bottom of the prepared baking dish. Sprinkle with 1 cup of shredded cheddar cheese. Spread half of the ground beef mixture over the cheese.
Evenly layer all the black beans over the beef. Spoon 1 cup of salsa over the beans. Arrange the remaining tortilla halves on top.
Spread the remaining ground beef mixture over the tortillas. Spoon the corn evenly on top, followed by the remaining 1 cup of salsa. Sprinkle with the remaining 2 cups of shredded cheddar cheese.
Bake, uncovered, until bubbly and the cheese is golden brown, about 25-30 minutes. Add toppings as desired.
Video
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Notes
Toppings are optional, but here are some great ideas: