Preheat the oven to 425°F (220°C). High heat gives you crisp skin and juicy meat.
Line a sheet pan with foil or parchment for easy cleanup. Set a wire rack on top if you have one.
Pat the chicken dry. Use paper towels to remove moisture from the skin. Dry skin equals better browning.
Mix the spice rub. In a small bowl, combine 2 teaspoons sweet paprika, 1 teaspoon smoked paprika, 1 teaspoon garlic powder, 1 teaspoon onion powder, 1 teaspoon dried oregano, 1.5 teaspoons kosher salt, and 1/2 teaspoon black pepper.
Add a pinch of cayenne if you want heat. Stir in 2 tablespoons olive oil, the zest of 1/2 lemon, and 1 teaspoon lemon juice to form a paste.
Season the chicken. Loosen the skin slightly with your fingers. Rub about half the paste under the skin and the rest over the top and bottom of each thigh.
This flavors the meat deeply and helps crisp the skin.
Arrange on the pan. Place thighs skin-side up on the rack or lined sheet, spacing them out so air can circulate. Don’t crowd the pan.
Bake. Roast for 30–40 minutes, depending on size, until the thickest part reaches 175–185°F (80–85°C). Thighs taste best a little higher than the standard 165°F because the connective tissue melts and the meat turns silky.
Optional broil. If the skin isn’t as crisp as you’d like, broil for 1–3 minutes.
Watch closely to avoid burning.
Rest and finish. Let the chicken rest for 5 minutes. Squeeze a little extra lemon juice over the top and sprinkle with chopped parsley. Serve hot.