01 - In a large mixing bowl, combine the olive oil, soy sauce, lime juice, minced garlic, ground cumin, smoked paprika, dried oregano, black pepper, kosher salt, and chili powder. Whisk until a smooth, uniform paste forms.
02 - Pat the butterflied chicken thoroughly dry with paper towels. Rub the marinade generously over the entire surface and carefully underneath the skin to ensure deep flavor penetration. Cover tightly and refrigerate for at least 2 hours, ideally overnight for maximum tenderness and taste.
03 - Preheat the oven to 425°F. Line a roasting pan with aluminum foil and set a wire rack over it. Place the chicken skin-side up on the rack, allowing even heat circulation around the bird.
04 - Roast the chicken for 45 to 55 minutes, until the skin turns deeply golden and crisp. Insert a kitchen thermometer into the thickest part of the thigh without touching bone — it should register 165°F. Remove from the oven and allow the chicken to rest for 10 minutes before carving to let the juices redistribute.
05 - While the chicken rests, combine the cilantro leaves, seeded jalapeño or serrano chile, garlic cloves, mayonnaise, sour cream, lime juice, Parmesan cheese, and olive oil in a blender or food processor. Blend on high until completely smooth and vibrant green. Season with salt and pepper to taste.
06 - Carve the rested chicken into serving pieces. Arrange on a platter and drizzle generously with the Aji Verde sauce. Serve alongside roasted potatoes or a crisp salad for an authentic Peruvian presentation.