Place turkey breast in the slow cooker. Rub the onion soup mix all over the turkey, including under the skin. Add butter on top of the turkey. Cover and cook.
Juicy Turkey With No Broth You don’t need to add any liquid to the slow cooker. The turkey will produce enough of its own juices to make a delicious whole turkey, with lots remaining for gravy. This recipe usually makes 4 cups of gravy, plenty for your mashed potatoes!