Cut the tortillas into triangles and fry them in vegetable oil. Set aside.

Cook the ground beef in oil. Once browned, add the chopped onion and season with salt and pepper.

On a greased baking sheet, layer the fried tortilla chips, sprinkle with ground beef, chopped tomato, and shredded cheese. Add more salt if needed. Repeat the layers as desired.

Bake at 350°F (175°C) until the cheese starts to melt, then increase the temperature to 420°F (215°C) to brown the cheese and make it crispy. Watch carefully to prevent burning.