Preheat oven to low-broil.
Separate the tortillas into two piles, one pile or three and another of four. Chop each pile of tortillas into 1 inch squares.
In a large oven-proof skillet or pot add oil, ground beef and onion over medium high heat. Crumble hamburger while it is cooking, continue to cook until meat is cooked all the way through 5-7 minutes.
Reduce heat to medium and add in corn, drained black beans, green chiles, and enchilada sauce. Cover and cook for 5 minutes, stirring occasionally.
Stir in 2 cups cheese and 4 tortillas. Cook while constantly stirring until cheese melts and tortillas softened, 3-5 minutes.
Remove from heat and top with the remaining 3 tortillas chopped and 2 cups of cheese. Place skillet in oven and broil until cheese has melted and golden brown, 3-5 minutes.
Remove from oven, top with freshly chopped cilantro, tomatoes and serve! Have additional toppings on the side like sour cream, salsa and chopped avocados.