Heat oil in fry pan. Fry corn tortillas for a few seconds on one side. Remove to cutting board. In center, place come chicken, black beans, onion, and cheese. Roll up enchilada and place in 9x13-inch baking dish. Be sure to do these steps quickly after tortilla is removed from fry pan or you will be unable to roll up the enchilada. Repeat for remaining enchiladas.
Pour over enchilada sauce and top with remaining cheese, olives and green onion. Bake in a 350 degree oven for 25 minutes.