Slow Cooker Herbed Turkey Breast

Step 1
Rinse turkey breast and pat dry with paper towels; sprinkle with salt and black pepper. Place 2 rosemary sprigs, 2 thyme sprigs, 1/4 cup chopped onion, and butter slices into turkey breast cavity.

Step 2
Place celery leaves, remaining white onion, and remaining rosemary and thyme sprigs into a large slow cooker. Lay turkey breast over vegetables and herbs with the top facing down. Pour white wine into cooker and cover.

Step 3
Cook on High until meat is tender and an instant-read meat thermometer inserted into the thickest part of the breast meat reads 170 degrees (75 degrees C), about 6 hours. Let turkey breast rest for 15 minutes before slicing.