Preheat the Oven: Set your oven to 425°F (220°C).
Make the Marinade: In a bowl, whisk together olive oil, garlic, lemon zest, lemon juice, rosemary, thyme, parsley, salt, and black pepper.
Marinate the Chicken: Coat the chicken thighs evenly with half the marinade and let them sit for at least 15 minutes.
Season the Potatoes: Toss the halved baby potatoes with the remaining marinade.
Assemble on a Sheet Pan: Arrange the chicken and potatoes in a single layer on a large baking sheet.
Roast: Bake for 35-40 minutes, stirring the potatoes halfway through, until the chicken reaches an internal temperature of 165°F (74°C) and the potatoes are golden and crispy.
Serve: Let rest for a few minutes, garnish with fresh herbs if desired, and enjoy!