Dry the Chicken: Pat all 4 chicken thighs thoroughly dry with paper towels on both sides. Removing surface moisture is essential for a crisp skin during roasting. Work at room temperature for at least 10 minutes before seasoning.
Season the Thighs: Combine 1.5 tsp kosher salt, 1 tsp black pepper, 1 tsp smoked paprika, 0.5 tsp garlic powder, and 0.5 tsp onion powder in a small bowl. Rub the spice blend evenly over all surfaces of each thigh, pressing the seasoning firmly under the skin where possible.
Preheat the Oven: Position an oven rack in the upper-middle slot and preheat the oven to 220°C (425°F). A high initial temperature drives rapid skin rendering, which produces colour and texture within the first 15 minutes of roasting.
Sear the Skin Side: Heat 1 tbsp avocado oil in an oven-safe skillet over medium-high heat until the oil shimmers visibly, approximately 2 minutes. Place the thighs skin-side down and sear undisturbed for 5-6 minutes until the skin releases from the pan and turns deep golden brown.
Flip and Transfer to Oven: Flip each thigh so the skin faces up, then transfer the skillet directly to the preheated 220°C (425°F) oven. The fond left on the pan will contribute to the pan sauce or drippings.
Roast the Thighs: Roast at 220°C (425°F) for 25-30 minutes until the skin is deeply caramelised and crackling at the edges. Begin checking the internal temperature at the 22-minute mark to avoid carryover overcooking.
Check Internal Temperature: Insert an instant-read thermometer into the thickest part of the thigh, avoiding the bone. The reading must reach 74°C (165°F) minimum. For optimal texture and full collagen conversion in dark meat, a target of 80-82°C (176-180°F) is preferred.
Rest and Serve: Transfer the cooked thighs to a wire rack and rest for 5 minutes before cutting. Resting allows the internal juices to redistribute, preventing liquid loss when the thigh is sliced.
