Preheat the Oven: Set your oven to 425°F and line a baking sheet with parchment paper or aluminum foil, spraying with cooking oil to prevent sticking.

Prepare the Chicken: Pat the chicken thighs dry with paper towels to remove moisture for crispy skin.

Make the Spice Mix: In a bowl, combine the baking powder, ranch seasoning, garlic powder, and black pepper, stirring until blended.

Season the Chicken: Rub the spice mixture all over each chicken thigh, including under the skin.

Arrange on the Pan: Place the seasoned thighs skin-side up on the baking sheet, ensuring they have space to crisp up.

Bake: Bake in the oven for 30-40 minutes, checking for doneness after 25 minutes for boneless thighs.

Check for Doneness: Ensure the internal temperature hits 165°F using a meat thermometer.

Baste and Serve: Baste the cooked thighs with pan juices and serve hot with your favorite sides.