In a large bowl, whisk together buttermilk, salt, honey, and black pepper until the salt dissolves.
Pour mixture into a gallon freezer or storage bag. Add remaining ingredients, including chicken.
Close bag securely and shake a few times to be sure the chicken is well coated. Place disposable bag into a mixing bowl or on a rimmed cooking sheet for security in case of a leak. Store in refrigerator or at least 8 hours and up to 24.
Remove chicken thighs from brine and let drain on a rack for about 10 minutes.
Prepare a large baking sheet by lining with aluminum foil and spray with non-stick cooking spray.
Place chicken thighs on baking sheet skin side up. Brush tops with cooking oil.
Roast in a 350 degree preheated oven for 1 hour or until internal temperature reaches 165 degrees.