01 - Whisk together olive oil, lime juice and zest, minced garlic, chili powder, cumin, smoked paprika, salt, and black pepper in a bowl. Coat chicken breasts thoroughly and refrigerate for 30 minutes to 2 hours.
02 - Combine sour cream, mayonnaise, salsa, lime juice, honey, and garlic powder in a small bowl. Whisk until smooth and refrigerate until serving.
03 - Preheat grill or grill pan to medium-high heat. Remove chicken from marinade and grill for 6 to 7 minutes per side until internal temperature reaches 165°F and chicken shows light charring.
04 - Place shredded cheese on each chicken breast during the final 2 minutes of cooking. Cover grill briefly to melt cheese. Remove chicken and let rest for 5 minutes.
05 - Plate chicken breasts and drizzle with fiesta sauce. Top with pico de gallo, fresh cilantro, and lime wedges. Serve immediately.