Prep and preheat: Heat the oven to 400°F (200°C). Pat the chicken thighs very dry with paper towels. Dry skin is key to crispiness.
Season the chicken: In a small bowl, mix 1 teaspoon salt, pepper, oregano, thyme, and smoked paprika.
Rub this all over the chicken, lifting the skin gently to season underneath.
Make the flavor base: In another bowl, combine 2 tablespoons olive oil, garlic, lemon zest, and half the lemon juice. Spoon a little under the skin and the rest on top. Let it sit while you prep the pan.
Sear for crispy skin: Heat a large oven-safe skillet (cast iron works best) over medium-high.
Add the remaining 1 tablespoon olive oil. Place the chicken thighs skin-side down and cook without moving for 5–7 minutes, until the skin is deeply golden and crisp. Work in batches if needed.
Add aromatics: Flip the chicken skin-side up.
Nestle in the red onion wedges, olives, sun-dried tomatoes, and capers. Pour the chicken broth around the thighs, not over the skin, and squeeze in the remaining lemon juice.
Roast to finish: Transfer the skillet to the oven and roast 18–22 minutes, or until the thickest part of the thigh reaches 175–185°F (79–85°C). Thighs are best a bit higher than 165°F for tenderness.
Rest and garnish: Let the chicken rest 5 minutes.
Spoon the pan juices over the top. Sprinkle with parsley and feta if using. Taste and adjust salt with the remaining 1/2 teaspoon if needed.
Serve: Pair with couscous, orzo, roasted potatoes, or a simple green salad to soak up the lemony pan sauce.