Pour the buttermilk marinade ingredients into a large sealing plastic bag.
Add in the chicken, seal the bag and then swirl around to coat the chicken completely.
Place into the refrigerate for at least 4 hours, making sure to turn the bag over once in a while. If you can, marinating overnight is the best.
When you are ready to cook the chicken, preheat your oven to 375 °F.
Remove the chicken from the marinade and place onto a baking sheet lined with a rack. Place the pieces 1-2 inches apart, leaving space between.
Bake in the oven for 30-35 minutes or until the meat reaches an internal temperature of 185 °F.
Remove and serve.
Notes
Note that the calories include all of the buttermilk marinade, which is not accurate. Calories etc will be closer to plain chicken thighs with a tiny bit of buttermilk on them.