01 - In a large mixing bowl, combine olive oil, lime juice, minced garlic, soy sauce, white vinegar, ground cumin, smoked paprika, dried oregano, chili powder, salt, and black pepper. Whisk until thoroughly blended into a smooth, fragrant marinade.
02 - Coat the chicken thoroughly with the marinade, using your hands to rub the mixture under the skin and into every crevice. Cover tightly and refrigerate for at least 2 hours, though overnight marination yields the most flavorful results.
03 - Preheat the oven to 425°F (220°C). Position the oven rack in the center to ensure even heat circulation during roasting.
04 - Place the marinated chicken skin side up on a wire rack set over a roasting pan. Roast for 45 to 50 minutes, until the skin turns deeply golden and crisp, and an instant-read thermometer inserted into the thickest part of the thigh registers 165°F (75°C).
05 - While the chicken roasts, combine mayonnaise, sour cream, jalapeños, cilantro, garlic, lime juice, olive oil, and salt in a blender or food processor. Blend until completely smooth and vibrant green. Transfer to a bowl, cover, and refrigerate until ready to serve.
06 - Remove the chicken from the oven and let it rest for 10 minutes to allow the juices to redistribute. Carve into serving portions and arrange on a platter. Serve with the chilled Aji Verde sauce alongside.