Marinate the Chicken: In a bowl, combine the sweet chili sauce, soy sauce, olive oil, and minced garlic. Add the chicken, ensuring it is evenly coated. Cover and marinate for at least 30 minutes, or up to 2 hours for extra flavor.
Preheat the Grill: Preheat your grill to medium-high heat, about 375°F (190°C).
Grill the Chicken: Remove the chicken from the marinade (discard any remaining marinade), and place the chicken on the grill. Grill for 5-7 minutes on each side, or until the chicken reaches an internal temperature of 165°F (74°C) and has beautiful grill marks.
Serve and Garnish: Once cooked, remove the chicken from the grill and let it rest for a few minutes. Garnish with fresh cilantro or chopped green onions before serving.