SEASON meat with salt and pepper to taste. Brown meat in 2 tbsp. hot oil in large skillet. Transfer to 5-qt. slow cooker.
STIR soup, mushrooms, 1 cup Crispy Fried Onions, Worcestershire and water into slow cooker.
COVER; cook on HIGH setting for 4 hours (or on LOW for 8 hours) until meat is tender. Serve over noodles and sprinkle with remaining onions. If desired, serve with a dollop of sour cream.