In a large bowl, combine the olive oil, garlic powder, onion powder, smoked paprika, dried thyme, salt, black pepper, and cayenne pepper (if using).
Add the chicken thighs to the bowl and toss until they are evenly coated with the seasoning mixture.
Place the seasoned chicken thighs skin-side up on a baking sheet lined with parchment paper or in a greased baking dish.
Squeeze the lemon juice over the chicken thighs.
Bake in the preheated oven for 35-40 minutes, or until the chicken reaches an internal temperature of 165°F (75°C) and the skin is crispy and golden brown.
Remove from the oven and let the chicken rest for 5 minutes before serving.
Garnish with chopped parsley before serving.
Notes
For extra flavor, marinate the chicken in the seasoning mixture for 1-2 hours or overnight in the refrigerator before baking.
Try adding vegetables like carrots, potatoes, or bell peppers to the baking sheet for a complete one-pan meal.