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 and coat thoroughly. Marinate in refrigerator for at least 30 minutes up to 2 hours.
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. Remove chicken from marinade and 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. Cover grill briefly to melt cheese. Remove from heat and let rest for 5 minutes.
05 - Transfer chicken to serving plates. Drizzle with fiesta sauce, top with pico de gallo or diced tomatoes, and garnish with fresh cilantro leaves and lime wedges.