Beef Enchiladas

1 pound ground beef
1/2 cup chopped onion
1 cup buttermilk
1/2 teaspoon salt
1 teaspoon garlic powder
1 tablespoon chili powder
1 dozen corn tortillas
1 cup Cheddar and jack cheeses, shredded

Brown beef with onion. Let cool and add 1/2 cup buttermilk to make gravy. Add salt, garlic powder and chili powder. Stir until thick. Dredge corn tortillas in remaining 1/2 cup of buttermilk to soften. Put beef into tortillas and roll up into cylinders. Place cylinders in a greased baking dish. Sprinkle cheese on top and cook until cheese is melted.