01 - In a large bowl, combine olive oil, lime juice, minced garlic, soy sauce, white vinegar, cumin, smoked paprika, oregano, chili powder, salt, and pepper. Whisk until fully blended into a smooth marinade.
02 - Coat the chicken thoroughly with the marinade, using your hands to work the mixture under the skin for deeper flavor penetration. Cover tightly and refrigerate for at least 2 hours, ideally overnight for best results.
03 - Preheat the oven to 425°F (220°C). Arrange a baking rack set inside a roasting pan.
04 - Place the marinated chicken skin side up on the prepared rack. Roast for 45 to 50 minutes, until the skin is deeply golden and crisp, and an instant-read thermometer inserted into the thickest part 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. 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 pieces and arrange on a platter. Serve with the chilled green sauce alongside roasted potatoes, rice, or a fresh salad.