Put raw sliced onions in a slow cooker with these 2 ingredients. Dinner doesn’t get easier June 19, 2025 by admin Slow Cooker 3-Ingredient French Onion Beef Servings: 4 Ingredients 2 pounds beef chuck roast 2 large onions, thinly sliced 1 packet (about 1 oz) of French onion soup mix Directions Read more on next page ADVERTISEMENT ←PreviousNext→