Season the chicken thighs with salt, ground black pepper, and smoked paprika, coating evenly.
Drizzle the chicken with lemon juice and marinate for about 15 minutes.
Heat the olive oil in a large skillet over medium-high heat. Add the marinated chicken thighs skin-side down and sear for about 5-7 minutes.
Flip the chicken and add minced garlic and sliced red onion. Sauté for about 2-3 minutes until the onion is translucent.
Add the halved baby potatoes, season with additional salt, and sprinkle brown sugar over the top.
Reduce heat to medium-low, cover the skillet, and cook for about 25-30 minutes, stirring occasionally.
Once cooked, remove from heat and sprinkle with chopped parsley before serving.