Roast Beef In Crock-Pot2025-08-04 22:24:11.569881 +0000 UTCIngredients2 lb. thinly sliced deli roast beef1 pkg. Lipton onion soup mix1 can cream of mushroom soupDirectionsCombine in crock-pot and cook 1 1/2 hours on high or 3 hours on low. Serve on buns if desired.