01 - Set the oven to 425°F, allowing it to reach temperature before cooking.
02 - Pat the chicken thighs dry thoroughly with paper towels and season both sides evenly with kosher salt and black pepper.
03 - Warm olive oil in a large oven-safe skillet over medium-high heat until shimmering.
04 - Place chicken thighs skin-side down in the skillet and cook without moving for 7 to 8 minutes until the skin is crisp and golden brown.
05 - Distribute rosemary sprigs, smashed garlic cloves, and lemon zest around the chicken in the skillet.
06 - Transfer the skillet to the preheated oven and roast for 20 to 25 minutes until the internal temperature of the chicken reaches 165°F.
07 - Remove chicken from oven and let rest for 5 minutes. Serve hot, garnished with extra rosemary and lemon wedges if desired.