Follow these step-by-step instructions carefully to ensure your Herbed Chicken and Potatoes come out perfectly cooked, with crispy skin, tender meat, and beautifully roasted vegetables every single time.

Step 1: Prepare Your Oven and Pan
Preheat your oven to 425°F (220°C). Proper preheating is non-negotiable for achieving crispy results. A hot oven immediately starts searing the outside of the chicken and potatoes, locking in moisture and kickstarting the browning process. Place a large roasting pan or a sturdy, rimmed baking sheet in the oven while it preheats. Heating the pan itself will give you a head start on getting a great sear on the bottom of your potatoes.

Step 2: Prepare the Vegetables
While the oven preheats, prepare your vegetables. Wash and dry the potatoes thoroughly. Patting them dry is a key step for crispiness, as excess moisture will create steam and make them soft. Cut the potatoes into uniform 1.5-inch chunks. Peel the onion and cut it into 8 thick wedges. Separate the cloves from the head of garlic but leave their paper-like skins on; this protects them from burning and allows them to steam inside, becoming soft and sweet. In a large bowl, toss the potato chunks, onion wedges, and whole garlic cloves with 2 tablespoons of olive oil, 1/2 teaspoon of salt, and 1/4 teaspoon of black pepper. Mix until everything is evenly coated.

Step 3: Create the Herb Marinade
In a separate small bowl, combine the ingredients for the herb marinade. Whisk together the 1/4 cup of olive oil, minced garlic, chopped rosemary, thyme, parsley, and lemon zest. Add the remaining 1 teaspoon of kosher salt, 3/4 teaspoon of black pepper, and the optional paprika. Stir until you have a thick, fragrant paste.

Step 4: Season the Chicken
Pat the chicken thighs completely dry with paper towels. This is the single most important step for achieving gloriously crispy skin. Any moisture left on the skin will turn to steam in the oven and prevent it from browning and crisping up. Once dry, generously rub the herb marinade all over the chicken thighs. Don’t be shy—gently lift the skin and work some of the marinade directly onto the meat for maximum flavor infusion. Ensure every part of the chicken is coated.

Step 5: Assemble the Dish for Roasting
Carefully remove the hot roasting pan from the oven. Spread the prepared potatoes, onions, and garlic in a single, even layer across the bottom of the pan. Pour the 1/2 cup of chicken broth over the vegetables. This will create a flavorful steam that helps cook the potatoes from the inside out. Arrange the seasoned chicken thighs on top of the vegetable layer, skin-side up. Make sure not to overcrowd the pan; the ingredients need space for the hot air to circulate. If everything is too crowded, the food will steam instead of roast.

Step 6: Roast to Perfection
Place the pan in the preheated 425°F (220°C) oven. Roast for 40-50 minutes. The exact time will depend on the size of your chicken thighs. About halfway through the cooking time, you can baste the chicken with the pan juices for extra flavor, but do it quickly to avoid letting too much heat out of the oven. The dish is done when the chicken skin is deep golden-brown and crispy, and the meat is cooked through. The most reliable way to check for doneness is with a meat thermometer; insert it into the thickest part of the thigh (avoiding the bone) and it should read 165°F (74°C). The potatoes should be tender when pierced with a fork and have browned, crispy edges.

Step 7: Rest and Finish
Remove the pan from the oven. Transfer the chicken thighs to a cutting board or clean plate and let them rest for 5-10 minutes. This crucial step allows the juices to redistribute throughout the meat, ensuring every bite is moist and tender. While the chicken is resting, gently toss the potatoes and onions in the delicious pan juices. Squeeze the reserved lemon juice all over the vegetables in the pan to brighten the flavors. You can also squeeze the roasted, softened garlic from their skins and mix them in with the potatoes or serve them on the side.

Step 8: Serve and Enjoy
Serve the rested chicken thighs alongside the herbed potatoes and caramelized onions. Drizzle any remaining pan juices over the top. Garnish with a bit of fresh parsley if desired and enjoy your spectacular one-pan meal.