Place the turkey over them, skin side up. Add the wine and crumbled stock cube. Cover and cook for 3 hours on HIGH, or cook until the turkey registers an internal temperature of 75C (165F) on a meat thermometer tested at the thickest part of the breast. The meat juices should run clear.
Transfer the turkey onto a platter and tent with foil, resting for up to 30 minutes. Your turkey crown will look a little pale due to the moist slow cooking. You can place it under the grill /broiler for a few minutes to brown the skin, basting with butter, if you like.
THE BEST TURKEY GRAVY
I have used Xanthan Gum to make a Keto friendly gravy. You can use cornstarch /cornflour to thicken the gravy instead if you like – take a look at the recipe card notes.
Prepare the gravy while your slow cooker turkey breast is having a rest. Strain the liquid collected in the crock pot into a saucepan and discard the vegetables.
Add hot chicken (or beef stock you prefer a darker gravy), Worcestershire sauce, mustard, butter and lemon juice and bring to a boil. Lower the heat and simmer for 10 minutes.
Add the Xanthan gum or cornflour slurry and continue cooking, using a balloon whisk to stir, for a further 10 minutes, or until the gravy starts to thicken slightly (it will thicken even more as it cools).