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, 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 (approximately 375°F). Remove chicken from marinade, letting excess drip off. Grill for 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 cooking, top each chicken breast with shredded cheese. Close grill lid briefly to melt cheese. Transfer chicken to a platter and let rest for 5 minutes.
05 - Drizzle fiesta sauce over rested chicken. Top with pico de gallo or diced tomatoes. Garnish with fresh cilantro leaves and lime wedges. Serve immediately.