Preheat the oven to 400 degrees F. Line a large baking sheet with foil, then place a wire rack on the tray. Spray with non-stick spray.
Pat the chicken thighs dry with paper towels. If any pieces of chicken have large excess flaps of fat, trim it off.
3-4 lbs bone-in skin-on chicken thighs
Place the dried chicken in a large bowl. Add the oil, salt, garlic powder, pepper, and baking powder on top. Toss well until the chicken is easily coated.
2 tablespoon olive oil, 1½ teaspoon kosher salt, 1 teaspoon garlic powder, ½ teaspoon pepper, 1 tablespoon baking powder
Place the chicken on the wire rack, spread out as evenly as possible. Bake for 30-40 minutes, or until an instant read thermometer reads at least 165 degrees (see the notes for more information on temperature).
While the chicken is cooking, combine the sauce ingredients in a small bowl.
2 tablespoon butter, 1 teaspoon lemon zest, 1 tablespoon lemon juice, ½ teaspoon garlic powder, ¼ cup parmesan cheese, 1 teaspoon dried parsley, ¼ teaspoon red pepper flakes, ¼ teaspoon dried oregano
Once the chicken reaches the desired temperature, switch the oven to the broiler and broil on high for the last 3-4 minutes, watching carefully so it doesn’t burn. Remove once golden and crispy, then brush each piece generously with sauce. Serve immediately.