Rub the chicken thighs with garlic powder, smoked paprika, and black pepper on both sides.
Heat olive oil in a large skillet over medium-high heat, then sear the chicken skin-side down for 5 minutes until golden brown, flip, and cook for 3 minutes more, then remove and set aside.
Add the diced onion to the same skillet and cook for 2 minutes until softened, then stir in the rice and cook for 1 minute.
Pour in the chicken broth, bring to a boil, then nestle the chicken thighs on top, reduce heat to low, cover, and simmer for 20 to 22 minutes until the rice is tender and the chicken reaches 165°F / 74°C at the thickest part.
Remove from heat, let rest covered for 5 minutes, then serve the chicken over the rice.