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, turning to coat evenly. Refrigerate for at least 30 minutes or 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, allowing excess to drip off. Grill for 6 to 7 minutes per side until internal temperature reaches 165°F and chicken shows light charring.
04 - During the final 2 minutes of cooking, place shredded cheese on top of each chicken breast. Close grill lid briefly until cheese is melted and bubbly.
05 - Transfer chicken to a cutting board and let rest for 5 minutes. Plate the chicken, drizzle generously with fiesta sauce, and top with pico de gallo. Garnish with fresh cilantro and lime wedges.