Preheat your oven to 425°F. Line a baking sheet with aluminum foil or parchment paper for easy cleanup.
In a small bowl, combine the garlic powder, onion powder, smoked paprika, dried thyme, salt, and black pepper.
Pat the chicken thighs dry with paper towels to achieve a crispy skin.
Place the chicken thighs in a large bowl and drizzle with olive oil and lemon juice. Sprinkle the spice mixture over the chicken and rub it in, ensuring the thighs are evenly coated.
Arrange the chicken thighs skin-side up on the prepared baking sheet.
Bake in the preheated oven for 35-40 minutes, or until the internal temperature reaches 165°F and the skin is crispy and golden brown.
Remove from the oven and let the chicken rest for 5 minutes before serving. Garnish with fresh parsley if desired.