Crockpot Beef with broth

2 lbs cubed beef stew meat 2 (10 ounce) cans condensed golden mushroom soup (do not use cream of mushroom) 1 (10 ounce) can onion soup (or 1/2 pkg dry onion[...]

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