To make a turkey breast stuffed with spinach and feta, you'll first need to prepare the stuffing. You can use store-bought spinach, or you can make your own. Place the turkey in the refrigerator for at least 1 hour, then remove it from the fridge and let it sit for 30 minutes. Then, place the bacon on the inside of the breast, and wrap it tightly with cling wrap. Let it rest for 10 minutes before slicing it into 1/4-inch slices.