This is a fine way to use any kind of taco meat that you might have left over. Matter of fact, I make extra so I can do this with it. It came to me in a moment of inspiration when I had lots of meat left over and wanted something fairly portable to take to work.
Spicy Meat, chopped fine
small can Hatch chiles or fresh equivalent
black olives, chopped
1 can black beans, drained
1 small can Ro-tel tomatoes
frozen corn (optional)
Layer from bottom: sour cream, tortillas, all of the black beans, meat (1 1/2 cups or so), 1/2 of the tomatoes, 1/2 of the cheese, chiles. Tortillas, sour cream, the rest of the tomatoes, olives, the rest of the cheese. Bake 30-45 minutes.