Prep the pan: Preheat your oven to 425°F (220°C). Line a sheet pan with foil for easy cleanup and set a wire rack on top.
This helps hot air circulate and crisps the skin.
Dry the chicken: Pat the thighs very dry with paper towels. The drier the skin, the crispier the result.
Mix the seasoning: In a small bowl, combine salt, pepper, garlic powder, onion powder, smoked paprika, thyme, and red pepper flakes if using.
Oil and season: Rub the thighs with olive oil, then sprinkle the seasoning evenly on both sides. Press gently to help it stick.
Arrange for even cooking: Place the thighs skin-side up on the wire rack, leaving a little space between each piece.
Roast: Bake for 35 to 45 minutes, depending on size.
The skin should be deep golden and crisp, and the internal temperature should reach 165°F (74°C) at the thickest part, away from the bone.
Optional broil: For extra crackle, broil on high for 1–3 minutes at the end. Watch closely to prevent burning.
Rest and serve: Let the chicken rest for 5 minutes. Finish with a squeeze of lemon and a sprinkle of parsley if you like.