Preheat the oven: Set your oven to 425°F (220°C). A hot oven helps render the fat and crisp the skin.
Pat the chicken dry: Use paper towels to dry the chicken thighs thoroughly.
Dry skin equals better browning and crispiness.
Mix the seasoning: In a small bowl, combine salt, pepper, garlic powder, onion powder, smoked paprika, thyme, and chili flakes if using.
Rub with oil and spices: Drizzle the thighs with olive oil and coat evenly with the spice mix, getting some under the edges of the skin if possible.
Start skin-side down: Heat an oven-safe skillet over medium-high heat. Add a little oil if needed. Place the thighs skin-side down and sear for 4–5 minutes until the skin is golden and crisp.
Flip and roast: Turn the thighs skin-side up.
Transfer the skillet to the oven and roast for 18–22 minutes, or until the internal temperature reaches 165°F (74°C) at the thickest part.
Optional butter baste: In the last 5 minutes, add butter to the pan and spoon it over the thighs for extra richness.
Rest and finish: Let the chicken rest for 5 minutes. Squeeze a little lemon juice over the top and sprinkle with fresh herbs.
Serve: Pair with keto sides like roasted broccoli, cauliflower mash, zucchini noodles, or a fresh cucumber salad.