Preheat the oven: Set to 425°F (220°C).
A hot oven helps render the chicken fat and crisp the skin.
Make the marinade: In a large bowl, whisk together olive oil, lemon zest, lemon juice, garlic, rosemary, thyme, oregano, smoked paprika, salt, pepper, and red pepper flakes.
Season the chicken: Pat thighs dry with paper towels. Add them to the bowl and toss to coat, lifting the skin gently to rub some marinade underneath for extra flavor.
Prep the potatoes: Add halved potatoes to the remaining marinade in the bowl and toss well. If the bowl looks dry, drizzle in another teaspoon of olive oil.
Arrange the pan: Spread potatoes on a large rimmed sheet pan or oven-safe skillet.
Nestle chicken thighs on top, skin-side up. Pour any leftover marinade over everything.
Roast: Bake for 35–45 minutes, until the chicken skin is crisp and the internal temperature reaches 165°F (74°C). Potatoes should be tender and golden at the edges.
Broil for extra crispness (optional): Broil 1–3 minutes to deepen color.
Watch closely to avoid burning.
Rest and finish: Let the chicken rest 5 minutes. Sprinkle with chopped parsley and an extra squeeze of lemon if you like.
Serve: Spoon pan juices over the chicken and potatoes. Add a simple green salad or steamed green beans on the side.