Pat the chicken thighs dry with paper towels to remove excess moisture.
In a small bowl, mix paprika, onion powder, salt, and black pepper.
Rub the seasoning evenly over the chicken thighs.
Place green beans in a microwave-safe dish with water and cook for 8–10 minutes until slightly tender but still crisp. Drain and set aside.
Heat a large skillet over medium-low heat and melt 2 tablespoons of butter.
Add chicken thighs and cook for 5–6 minutes per side until golden and fully cooked (internal temperature 75°C). Remove and set aside.
In the same skillet, melt remaining butter. Add garlic, parsley, hot sauce, and chili flakes.
Stir in green beans and cook for 4–5 minutes.
Add lemon juice and chicken stock, letting the sauce reduce slightly.
Return chicken to the skillet, spoon sauce over it, and reheat briefly.
Serve the Lemon Garlic Butter Chicken Skillet warm with lemon slices and extra parsley.