Use Cooking Spray on inside of crock. Place onion slices at the bottom of the crock.

Place the beef on the onions. Spread Salt, Pepper and Garlic Powder over the Beef on all sides.

Cover the Beef with most of the Vinaigrette Dressing, Spread the Carrots, Celery and any additional onions and use your remaining Vinaigrette to drizzle over them.

Cook on high for 4-5 hours. You may need to add an additional hour if the beef is frozen. Be sure to use a meat thermometer to check the temperature of the beef before serving.