Preheat the oven: Set to 425°F (220°C). Line a sheet pan with foil and place a wire rack on top for best crisping.
Pat the chicken dry: Use paper towels to remove surface moisture. Dry skin equals better browning.
Mix the Cajun seasoning: In a small bowl, combine 1.5 teaspoons salt, 1 teaspoon black pepper, 1 tablespoon paprika, 1 teaspoon smoked paprika, 1 teaspoon garlic powder, 1 teaspoon onion powder, 1 teaspoon dried oregano, 1 teaspoon dried thyme, and 1/4 to 1/2 teaspoon cayenne.
Add 1 to 2 teaspoons brown sugar if you like a touch of sweetness.
Oil and season: Rub 1 to 2 tablespoons oil over the thighs. Sprinkle the seasoning evenly on both sides, lifting the skin gently to season underneath for extra flavor.
Arrange on the rack: Place thighs skin-side up with a little space between each piece to promote airflow and crisping.
Roast: Bake for 30–40 minutes, depending on size. You’re aiming for an internal temperature of 175–190°F for tender, juicy thighs.
The skin should look crisp and lightly blistered.
Optional broil: For extra-crisp skin, broil on high for 1–2 minutes at the end. Watch closely to prevent burning.
Rest and finish: Let the chicken rest 5 minutes. Squeeze fresh lemon over the top and sprinkle with chopped parsley or green onions.
Serve: Pair with rice, creamy coleslaw, cornbread, roasted potatoes, or sautéed green beans.
The juices from the pan make a great drizzle for rice or veggies.