Preheat your oven to 400°F (200°C).
In a large bowl, combine the ranch seasoning mix, garlic powder, onion powder, paprika, salt, and black pepper.
Add the olive oil to the bowl and mix until a paste forms.
Coat each chicken thigh with the seasoning mixture, ensuring they are well covered.
Place the seasoned chicken thighs on a baking sheet lined with parchment paper, skin side up.
Bake in the preheated oven for 35-40 minutes, or until the chicken reaches an internal temperature of 165°F (74°C) and the skin is crispy.
Remove from the oven and let rest for 5 minutes before serving.
Garnish with chopped fresh parsley before serving.