Pat the chicken thighs dry with paper towels and season both sides with salt, pepper, garlic powder, onion powder, cayenne powder, and smoked paprika. Preheat the oven to 375°F.
Heat olive oil in a large, deep skillet or Dutch oven over medium-high heat. Add the chicken thighs skin-side down and sear until golden brown and crispy, about 5-7 minutes. Flip and cook another 5 minutes. Remove from the skillet and set aside.
In the same skillet, add the diced onion and sauté for 3-4 minutes until softened. Stir in the garlic and cook for 1 more minute.
Add the rice and additional smoked paprika, stirring for 1-2 minutes to toast the rice slightly.
Pour in the chicken broth and bring to a simmer, seasoning with additional salt and pepper.
Nestle the chicken thighs back into the skillet, skin-side up, on top of the rice. Cover and bake in the preheated oven for 25-30 minutes, or until the rice is tender and the chicken is fully cooked.
Let the dish rest, covered, for 5 minutes before garnishing with fresh parsley and serving.