Preheat your oven to 400°F (200°C).
In a large bowl, combine the olive oil, smoked paprika, garlic powder, onion powder, oregano, salt, and black pepper. Mix well to create a marinade.
Add the chicken thighs to the bowl and toss them in the marinade until they are evenly coated. Let them marinate for at least 15 minutes (or up to 2 hours in the refrigerator for more flavor).
Arrange the marinated chicken thighs in a single layer on a baking sheet lined with parchment paper.
Drizzle the lemon juice over the chicken.
Bake in the preheated oven for 25-30 minutes, or until the chicken is cooked through and has an internal temperature of 165°F (75°C).
Remove from the oven and let the chicken rest for 5 minutes before slicing. Garnish with chopped parsley before serving.