Mix the softened butter, garlic, and fresh thyme in a bowl then carefully peel skin away from the turkey breast and rub butter mixture under the skin.
Place turkey in a large zip-top freezer bag along with the salt and chicken or turkey stock.
Seal bag and remove as much air from the bag as possible before dropping turkey into the sous vide water bath. Cook for 12 hours.
Remove turkey from bag, pat dry with a paper towel then leave to rest on the counter for 30 minutes before brushing with avocado oil or melted butter.
Preheat oven to 450° Fahrenheit then transfer turkey to the oven to roast for 25-30 minutes or until golden brown and crispy.
Recipe Notes
Anything smaller than a 2-gallon bag likely won't hold the whole turkey. You need to be able to remove all the air from the bag and seal it tight, so when in doubt, size up!
Not sure what size turkey you'll need? We've got a handy formula and conversion chart in our How Much Turkey Per Person? post.
Water Displacement Method: Place your ingredients in an appropriately-sized sealable food-safe bag (not a vacuum sealing bag) and seal the bag halfway across the top. Heat the water with the sous vide immersion circulator as instructed, then slowly lower the half-sealed bag into the heated water. The temperature difference will force the air out of the bag – you should see the plastic cling to the food. Once the food is entirely submerged and all the air is out of the bag, seal the bag completely and continue with the instructions.
Make it Paleo: Use ghee instead of softened butter.