Crockpot Beef with lemon

2 pounds stewing beef 10 1/2 ounces soup, cream of mushroom one can 12 ounces lemon-lime soda, sugar-free * 1 1/4 ounces onion soup mix one envelope 1 medium[...]

1 large onion , halved and sliced thin 8 ounces portabello mushrooms , sliced 2 tablespoons butter 1 tablespoon oil 1 tablespoon flour 3 garlic cloves ,[...]

1 large onion , halved and sliced thin 8 ounces portabello mushrooms , sliced 2 tablespoons butter 1 tablespoon oil 1 tablespoon flour 3 garlic cloves ,[...]