Use paper towels to pat the chicken thighs dry thoroughly.
In a small mixing bowl, combine the nigella seeds, garlic powder, onion powder, smoked paprika, olive oil, and a generous pinch of salt and black pepper. Mix until a thick, fragrant paste forms.
Take the spice paste and rub it evenly all over each chicken thigh, lifting the skin gently to massage some of the mixture directly onto the meat underneath.
Place the seasoned chicken thighs, skin-side up, on a baking sheet lined with parchment paper.
Roast the thighs in the preheated oven for 30-35 minutes until the skin is golden brown and crispy, and a meat thermometer registers an internal temperature of 165°F (74°C).
For extra crispiness, switch the oven to broil in the last 3-5 minutes of cooking, watching closely to ensure the skin doesn't burn.
Once cooked, remove the chicken from the oven and let it rest for about 5 minutes before serving. Sprinkle with freshly chopped parsley.