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1. Salt and pepper your beef roast. In a large frying pan or dutch oven melt 1 tablespoon of butter. Sear the roast on all sides. Remove the roast and place the sliced onions in the pan to saute until translucent.
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2. Place the roast, sauteed onions and garlic powder in the crock pot, turn on low with the lid on and cook 7 hours or until the roast is tender.
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3. Remove the broth from the crock pot to a saucepan. Stir the flour into the sour cream, add 1/2 cup canned beef broth or white wine, stir until combined. Add the broth from the crock pot. Heat the sour cream gravy until it thickens slightly. Add salt and pepper to taste. Spoon over sliced roast beef.