Preheat the oven: Set to 425°F (220°C). Place a rack in the middle position.
Pat the chicken dry: Use paper towels to remove surface moisture.
Dry skin is key for crispiness.
Make the herb butter: In a bowl, mix softened butter, garlic, rosemary, thyme, parsley, lemon zest, smoked paprika, salt, and pepper.
Loosen the skin: Gently slide a finger under the skin of each thigh to create a pocket without tearing it.
Butter under the skin: Divide about half the herb butter under the skin of each thigh and spread it around.
Coat the top: Rub the remaining herb butter over the skin. Drizzle or brush with olive oil to help browning.
Arrange on a pan: Place thighs skin-side up on a rimmed baking sheet or oven-safe skillet, spaced apart.
Roast: Cook for 30–40 minutes, depending on size. The skin should be deep golden and an instant-read thermometer should read 175–185°F in the thickest part.
Optional broil: For extra crisp skin, broil for 1–2 minutes.
Watch closely.
Rest and serve: Let rest 5 minutes. Finish with a squeeze of lemon and extra herbs if you like.