You can see that this is one of those flexible recipes that comes in handy when your tortillas are about to go stale. You can add any number of things to this skillet: Chopped green chiles, chopped fresh tomatoes, black beans in addition to or instead of the beef, etc.
1/2 lb. ground beef
1 small onion, chopped up
1 or 2 cloves of garlic, minced
1 15-oz can of tomato sauce
1 cup salsa
1 cup frozen corn
1/2 cup water
Chile powder, oregano, cumin, salt, pepper
4 or 5 flour or corn tortillas
1/2 cup grated cheese
Saute the onions and garlic together for a bit; add the ground beef and cook until all the pink is gone. Add the tomato sauce, salsa, corn, and water. Season with the chile powder, etc. to taste.
Bring to a boil, simmer for a few minutes while you chop up the tortillas. Stir in the tortillas and the grated cheese. Cook for another 10 minutes or so, until it is of a consistency that pleases you.
I like this with a dollop of plain yogurt on top. Non-heart healthy alternative: Sour cream.