Preheat your oven to 375°F (190°C). In a large skillet over medium heat, brown 1 pound of ground beef along with 1 diced onion and 2 minced garlic cloves, cooking until the meat is no longer pink. Drain excess fat, then stir in taco seasoning and simmer with black beans and corn for 5 minutes.

In a generously greased 9x13-inch baking dish, begin by spreading a layer of salsa or enchilada sauce evenly on the bottom. Next, lay down 2 flour tortillas to create a soft base, followed by one-third of the seasoned meat mixture and a sprinkle of shredded cheese. Repeat the layering process—tortillas, meat, and cheese—two more times, ensuring you finish with a final layer of cheese.

Cover the assembled Tortilla Lasagna with aluminum foil to trap in moisture, and place it in the preheated oven. Bake for 20 minutes uncovered, then remove the foil and continue baking for an additional 5-10 minutes or until the cheese is deliciously melted, bubbly, and golden brown on top.

After removing the baking dish from the oven, allow the Tortilla Lasagna to rest for about 5 minutes. Slice it into portions, and add your favorite toppings, such as sour cream, jalapeños, or fresh cilantro, to elevate the flavor before serving.