01 - Preheat the oven to 400°F. Lightly grease a large baking dish or line a sheet pan with parchment paper.
02 - In a small bowl, whisk together the honey, lemon juice, olive oil, Dijon mustard, dried thyme, dried rosemary, salt, black pepper, minced garlic, and lemon zest until well combined.
03 - Place the chicken thighs skin-side up and the halved baby potatoes in the prepared baking dish. Tuck the red onion wedges around the chicken and potatoes.
04 - Pour the honey lemon sauce evenly over the chicken and potatoes. Gently toss the potatoes and onions to coat, making sure the chicken remains skin-side up.
05 - Bake uncovered for 40–45 minutes, or until the chicken reaches an internal temperature of 165°F and the potatoes are golden and tender. Baste the chicken with pan juices halfway through baking for extra flavor and color.
06 - For extra-crispy skin, broil for an additional 2–3 minutes, watching carefully to avoid burning.
07 - Remove from the oven, garnish with chopped fresh parsley and lemon slices, and serve immediately.