Place turkey breast in slow cooker. Combine remaining ingredients in a small bowl and pour half of mixture over turkey. Store remainder of sauce in refrigerator.
Cook on high for one hour, then on low for 5-6 hours (or on low for a total of about 8-1/2 hours) until turkey is cooked through.
Remove turkey breast and allow to rest for 15 minutes. Heat remaining cranberry mixture in microwave for 30 seconds or until hot, and serve over sliced turkey breast.