Mix together: 1 can cream of chicken soup
1 can cream of mushroom soup
With one can water 2/3rds full-stir into the water 3 T of cornstarch and dissolve in the water, then mix the cornstarch misture into the soups until well blended. Pour this mixture over the roast. Put the lid on the crockpot and turn it to low. Cook 4-5 hours on LOW. What remains is the gravy that goes on the meat and mashed potatoes.