Stir beans, onions, 1/2 cup spour cream, seasonings, and 1 cup cheddar cheese.
Spread 1/3 cup of mixture in center of each tortilla. Roll up.
Pour a thin layer of enchilada sauce in bottom of a 13x 9 baking dish. Place tortillas in pan.Cover with remaining sauce. Bake at 350 for 15-20 minutes . Serve on a bed of shredded lettace top with remaining sour cream, cheese, and olives.