01 - In a large bowl, whisk together the olive oil, lime juice, minced garlic, soy sauce, white vinegar, ground cumin, smoked paprika, dried oregano, chili powder, salt, and black pepper until well combined.
02 - Coat the chicken thoroughly with the marinade, using your hands to rub the mixture under the skin. Cover and refrigerate for at least 2 hours, preferably overnight for maximum flavor penetration.
03 - Preheat the oven to 425°F (220°C).
04 - Place the chicken skin side up on a baking rack set over a roasting pan. Roast for 45 to 50 minutes until the skin is golden and crisp and an internal thermometer inserted into the thickest part registers 165°F (75°C).
05 - While the chicken roasts, combine the mayonnaise, sour cream, jalapeños, cilantro, garlic, lime juice, olive oil, and salt in a blender or food processor. Blend until completely smooth, then chill until ready to serve.
06 - Remove the chicken from the oven and let it rest for 10 minutes before carving. Serve with the chilled green sauce on the side alongside roasted potatoes, rice, or a simple salad.