Preheat oven and pan Place metal sheet pan in oven and preheat to 425F (220C). Letting the pan heat up with the oven means the chicken hits a hot surface immediately and starts crisping from the first second.
Dry the chicken Remove chicken thighs from fridge 15 minutes before cooking. Pat completely dry with paper towels - top, bottom, and any folds where moisture hides. This step is not optional. Wet skin steams instead of crisping.
Season the chicken Mix all spices together in a small bowl. Drizzle avocado oil over the chicken and rub to coat evenly. Sprinkle spice blend generously over both sides. For extra flavor, gently lift the skin and rub a small amount of seasoning directly underneath.
Bake skin side up Carefully remove the hot pan from the oven. Place chicken thighs skin side up directly on the hot metal pan. Leave space between each piece - crowded chicken steams instead of crisps. Bake for 35 to 40 minutes without opening the oven or flipping.
Check the temperature At 35 minutes, check the internal temperature with an instant-read thermometer inserted near the bone without touching it. For safe eating, 165F is the minimum. For best texture with thighs, pull at 175 to 185F - at this range the fat and collagen have fully rendered and the meat is more tender, not less.
Optional broil If the skin is golden but you want it crispier, turn the broiler to high for 2 to 3 minutes. Watch it closely - it goes from perfect to burnt fast. This step is optional. At 425F with a preheated metal pan, the skin usually does not need it.
Rest Remove from oven and rest on the pan for 5 minutes before serving. Resting lets the juices redistribute through the meat.
Serve Serve hot with your choice of sides. Spoon any pan drippings over the chicken or vegetables on the plate. The drippings are well-seasoned and add a lot of flavor.