Preheat the oven to 400°F (200°C).
Pat the chicken thighs completely dry with paper towels.
In a small bowl, mix the garlic powder, onion powder, smoked paprika, thyme, oregano, and cayenne pepper.
Drizzle olive oil or melted butter over the chicken thighs, then sprinkle with salt and black pepper. Rub the seasoning blend evenly over each piece.
Place the chicken thighs skin-side up on a baking sheet or dish, spacing them apart.
Bake uncovered for 35 to 45 minutes, or until the internal temperature reaches 165°F (74°C).
For extra crispy skin, broil for 2 to 3 minutes, watching carefully.
Let rest for 5 minutes, then sprinkle with fresh parsley before serving.