Brown ground beef with onion, drain. Add beans, ... bean on each bun half. Add cheese. Bake until ... Serve with tomato, sour cream and black olives, if desired. (8 open-faced sandwiches.)
In medium bowl, combine ground beef, salsa and seasoning mix; ... Serve on the bun with the tomatoes and lettuce and top with sour cream and/or guacamole.
Saute onion in butter. Stir in ground beef, seasoning, flour and mushroom ... minutes. Stir in sour cream. Serve on buns. Can also be served over rice.