Preheat your oven to 425°F.
Pat the chicken thighs dry with paper towels to ensure crispy skin.
In a small bowl, mix together the olive oil, garlic powder, onion powder, smoked paprika, dried thyme, salt, and black pepper.
Rub the spice mixture all over the chicken thighs, making sure to get under the skin for maximum flavor.
Place the chicken thighs skin-side up on a baking sheet lined with parchment paper.
Drizzle the lemon juice over the chicken thighs.
Bake in the preheated oven for 35-40 minutes, or until the internal temperature reaches 165°F and the skin is crispy.
Let the chicken rest for 5 minutes before serving. Garnish with chopped parsley if desired.