In a medium bowl, whisk together sweet chili sauce, lime juice, soy sauce, minced garlic, grated ginger, and olive oil until well combined.
Season the chicken breasts with salt and pepper, then place them in a resealable plastic bag or shallow dish. Pour the marinade over the chicken, ensuring each piece is evenly coated. Seal the bag or cover the dish and refrigerate for at least 30 minutes and up to 2 hours for maximum flavor.
Preheat your grill to medium-high heat.
Remove the chicken from the marinade, allowing excess marinade to drip off. Discard the remaining marinade.
Place the chicken breasts on the hot grill. Cook for about 6-7 minutes on each side, or until the internal temperature reaches 165°F (75°C) and the chicken has nice grill marks.
Once cooked, remove the chicken from the grill and let it rest for 5 minutes.
Slice the chicken and garnish with fresh cilantro before serving.
Notes
For best flavor, marinate the chicken for up to 2 hours.