01 - Whisk together olive oil, lime juice and zest, minced garlic, chili powder, cumin, smoked paprika, salt, and black pepper in a bowl. Add chicken breasts and coat thoroughly. Refrigerate for at least 30 minutes, up to 2 hours.
02 - Combine sour cream, mayonnaise, salsa, lime juice, honey, and garlic powder in a small bowl. Whisk until smooth and creamy. Refrigerate until serving.
03 - Preheat grill or grill pan to medium-high heat. Remove chicken from marinade and grill 6 to 7 minutes per side until internal temperature reaches 165°F and chicken develops light char marks.
04 - During the final 2 minutes of grilling, place shredded cheese evenly over each chicken breast. Cover grill briefly until cheese melts completely.
05 - Transfer chicken to a cutting board and let rest 5 minutes. Plate the chicken, drizzle with fiesta sauce, and top with pico de gallo. Garnish with fresh cilantro and lime wedges.