Pat the chicken thighs dry with paper towels. In a small bowl, mix together the nigella seeds, garlic powder, onion powder, smoked paprika, olive oil, salt, and pepper to form a paste.
Rub the spice mixture generously over each chicken thigh, ensuring to get under the skin for maximum flavor and crispiness.
Place the chicken thighs skin-side up on a baking sheet lined with parchment paper.
Roast in the preheated oven for 30-35 minutes or until the skin is golden brown and crispy, and the internal temperature reaches 165°F (74°C).
For even crispier skin, switch to broil for the last 3-5 minutes, keeping a close eye to avoid burning.
Remove from the oven and allow the chicken to rest for 5 minutes. Garnish with fresh parsley before serving.
Notes
For extra crispiness, broil for a few minutes at the end.