01 - Set the oven to 425°F (220°C) to prepare for roasting.
02 - Pat chicken thighs thoroughly dry using paper towels and season both sides evenly with kosher salt and freshly ground black pepper.
03 - Heat olive oil in a large ovenproof skillet over medium-high heat until shimmering.
04 - Place chicken thighs skin-side down in the skillet and cook undisturbed for 7 to 8 minutes until the skin turns golden and crisp.
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, or until the internal temperature reaches 165°F (74°C).
07 - Allow chicken to rest for 5 minutes before serving. Garnish with additional rosemary and lemon wedges as desired.