Email to Cat Elk: Crockpot Elk Roast Source of Recipe Alice McCabe List of Ingredients 1 large onion, sliced One medium to large elk roast 1 can cream of mushroom soup 1 package dry onion soup mix Instructions Place sliced onion in bottom of crockpot. Add elk roast next, then cream of mushroom soup and onion soup mix. Cook on LOW for 8 to 12 hours.