01 - Combine olive oil, lime juice and zest, minced garlic, chili powder, cumin, smoked paprika, salt, and black pepper in a bowl. Add chicken breasts, turning to coat evenly. Marinate in refrigerator for at least 30 minutes, up to 2 hours for maximum flavor.
02 - Whisk together sour cream, mayonnaise, salsa, lime juice, honey, and garlic powder in a small bowl until smooth and well combined. Refrigerate until ready to serve.
03 - Preheat grill or grill pan to medium-high heat (approximately 375°F to 400°F). Remove chicken from marinade, allowing excess to drip off. Grill for 6 to 7 minutes per side until internal temperature reaches 165°F and chicken develops slight char marks.
04 - During the final 2 minutes of grilling, distribute shredded cheese evenly over each chicken breast. Close grill lid briefly to melt cheese completely.
05 - Transfer chicken to a cutting board and let rest for 5 minutes to allow juices to redistribute. Plate chicken, drizzle generously with fiesta sauce, and top with pico de gallo or diced tomatoes. Garnish with fresh cilantro leaves and lime wedges.