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 turn to coat evenly. Marinate in the 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 (about 375°F). Remove chicken from marinade and discard excess liquid. Grill chicken for 6 to 7 minutes per side, or until internal temperature reaches 165°F and chicken has nice grill marks.
04 - During the final 2 minutes of grilling, top each chicken breast with shredded cheese. Close grill lid briefly to melt cheese. Remove chicken from grill and let rest for 5 minutes before serving.
05 - Plate chicken breasts and drizzle generously with fiesta sauce. Top with pico de gallo or diced tomatoes, fresh cilantro leaves, and lime wedges. Serve immediately while warm.