In a large bowl, combine the olive oil, smoked paprika, garlic powder, onion powder, oregano, salt, black pepper, and lemon juice. Whisk until well blended.
Add the chicken thighs to the bowl, ensuring they are fully coated with the marinade. Cover and refrigerate for at least 30 minutes, or up to 2 hours for more flavor.
Preheat your grill or a large skillet over medium-high heat.
Remove the chicken from the marinade and discard the leftover marinade.
Grill or cook the chicken for about 6-7 minutes on each side, or until the internal temperature reaches 165°F and the chicken is nicely browned.
Remove the chicken from the heat and let it rest for 5 minutes before slicing.
Garnish with chopped fresh parsley before serving.