Preheat your oven to 425°F (220°C). Pat chicken thighs dry; season with salt, pepper and smoked paprika.
In a mixing bowl, whisk together honey, mustard, orange juice, olive oil, oregano, garlic and red pepper flakes.
Arrange potatoes in a large roasting pan; nestle chicken thighs on top. Pour half the honey-mustard mixture over everything, tossing potatoes gently to coat.
Roast for 30 minutes, then brush the chicken and potatoes with remaining glaze. Return to oven and bake 10–15 more minutes, until chicken skin is crisp and an internal temperature of 165°F (74°C) is reached.
Switch oven to broil on high, slide the pan under the broiler for 2–3 minutes to caramelize the glaze—watch closely to prevent burning.
Remove from oven, let rest 5 minutes. Garnish with fresh parsley or dill before serving.