01 - Whisk together orange juice, lime juice, olive oil, minced garlic, oregano, cumin, salt, pepper, smoked paprika if using, and orange zest in a large bowl until thoroughly combined.
02 - Add chicken thighs to the bowl and turn to coat evenly with the marinade. Cover and refrigerate for at least 30 minutes, or up to 6 hours for optimal flavor penetration.
03 - Preheat oven to 425°F. Arrange chicken thighs skin-side up on a baking sheet or roasting pan, reserving any excess marinade for basting.
04 - Roast for 30-35 minutes, basting once or twice with the reserved marinade, until skin is golden brown and internal temperature reaches 165°F.
05 - Remove from oven and let rest for 5 minutes to allow juices to redistribute. Garnish with chopped cilantro or parsley and accompany with fresh lime wedges.