Crockpot Beef Burgundy

1 1/2 lbs beef stew meat 10 3/4 ounces condensed cream of mushroom soup, undiluted 1 cup red wine 1 small onion , chopped 1 (4 ounce) can sliced mushrooms,[...]

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