Place stew meat in the slow cooker (no need to brown it.) Add cream soups, onion soup mix, wine–this WILL make your stew turn purple, no worries–and optional mushrooms and chopped onion. Stir, then cook on low for 8-10 hours. If the sauce is too thin, add 2 tablespoons of flour dissolved in 1/3 cup of water and let it sit with the lid off while you cook the noodles. Serve over cooked egg noodles.