01 - Preheat the oven to 425°F (220°C).
02 - Pat chicken thighs dry with paper towels and season both sides evenly with kosher salt and 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 skin is golden brown and crisp.
05 - Arrange rosemary sprigs, smashed garlic, and lemon zest around the chicken in the skillet.
06 - Transfer skillet to preheated oven and roast for 20 to 25 minutes until internal temperature reaches 165°F (74°C).
07 - Remove chicken and let rest for 5 minutes before serving; garnish with additional rosemary and lemon wedges if desired.