This is a recipe a friend sent me from www.nellsoldfashionrecipes.com
1 beef sirloin tip roast (4 pounds)
1/2 cup all-purpose flour, divided
1 envelope onion soup mix
1 envelope brown gravy mix
2 cups cold water
1/2 teaspoon salt
1/2 teaspoon pepper
1/2 teaspoon garlic powder
Cut roast in half; rub with 1/4 cup flour. Place in crockpot.
In a small bowl, combine soup, salt, pepper, garlic powder and gravy mixes with remaining flour; whisk in water until blended. Pour over roast.
Cover and cook on low for 6 hours in crockpot. I like to use this recipe and make open face roast beef sandwiches and mashed potatoes.