Prep the thighs. Pat the chicken very dry with paper towels.
This helps achieve crisp skin. Trim excess skin or fat if needed.
Season generously. Mix the salt, pepper, paprika, and garlic powder. Sprinkle evenly on both sides of the thighs, focusing on the skin side for best flavor.
Preheat the pan. Heat a large oven-safe skillet over medium-high heat.
Add olive oil and let it shimmer before adding the chicken.
Sear skin-side down. Place thighs skin-side down in the hot skillet. Don’t overcrowd; work in batches if needed. Cook without moving them for 7–9 minutes until the skin is deeply golden and crisp.
Reduce heat slightly if the oil smokes.
Flip and sear the other side. Turn the thighs and cook 3–4 minutes to brown the underside.
Make the garlic butter. Push the chicken to the edges of the pan. Add butter to the center. Once melted, add the garlic, thyme, rosemary, and red pepper flakes if using.
Stir for 30–60 seconds until fragrant, keeping the garlic from burning.
Baste and finish. Spoon the garlic butter over the chicken. Add lemon juice and tilt the pan to coat. Reduce heat to medium-low, cover loosely with a lid or foil, and cook 6–10 minutes more, until the thickest part reaches 165°F (74°C).
Rest and garnish. Transfer chicken to a plate and let rest 5 minutes.
Stir parsley into the pan sauce, then spoon the sauce over the thighs. Serve with extra lemon wedges.