Whisk 1/4 cup olive oil, the finely grated zest of 2 medium lemons, 1/4 cup lemon juice, 3 minced garlic cloves, 1 tablespoon dried oregano, 2 teaspoons paprika, 1 1/2 teaspoons kosher salt, and 1/2 teaspoon black pepper together in a large bowl until combined.
Transfer about a third of the marinade (about 1/4 cup) to a 9x13-inch baking dish. Stir 1/4 cup low-sodium chicken broth into the marinade in the baking dish. Add 1 1/2 pounds chopped medium gold potatoes and toss to coat.
Pat 2 pounds bone-in, skin-on chicken thighs dry with paper towels. Use your fingers to gently loosen and pull the skin away from the meat without removing it. Add to the marinade in the bowl and rub all over, working it gently under the skin. Let sit at room temperature while the oven heats, at least 15 minutes.
Heat the oven to 425℉.
Place the chicken skin-side up on the potatoes. Roast until the chicken is cooked through and lightly browned, and the potatoes are tender, 45 to 50 minutes. Spoon the cooking liquid over the chicken. Garnish with finely chopped fresh parsley leaves and/or lemon slices if desired.
Recipe Notes