Step 1: Preheat Oven: Preheat oven to 400F (200C). Ensure the oven rack is positioned in the middle of the oven.
Step 2: Prepare Vegetables: In a large bowl, combine the potatoes, carrots, and onion. Add the minced garlic, olive oil, rosemary, thyme, salt, and pepper. Toss to coat all the vegetables evenly.
Step 3: Arrange in Baking Dish: Spread the vegetables in a single layer in a large baking dish (9x13 inch). A cast-iron skillet also works well.
Step 4: Add Chicken: Place the chicken thighs on top of the vegetables. If using lemon, tuck lemon slices around the chicken and vegetables.
Step 5: Roast in Oven: Place the baking dish in the preheated oven and roast for 45-50 minutes, or until the chicken is cooked through and the vegetables are tender. The internal temperature of the chicken should reach 165F (74C).
Step 6: Check for Doneness: To ensure the chicken is cooked through, insert a meat thermometer into the thickest part of a thigh, avoiding the bone. The vegetables should be easily pierced with a fork. If the chicken skin is not as crispy as desired, broil for the last few minutes, keeping a close eye to prevent burning.
Step 7: Rest and Serve: Remove the baking dish from the oven and let the chicken and vegetables rest for 5-10 minutes before serving. This allows the juices to redistribute, resulting in a more tender and flavorful meal.
Optional Tips: For extra crispy chicken skin, pat the chicken thighs dry with paper towels before seasoning. To add a touch of acidity, drizzle balsamic vinegar over the vegetables during the last 10 minutes of cooking. Substitute other root vegetables such as parsnips or turnips for the carrots, depending on preference.