In a mixing bowl whisk together the soy sauce, honey, lime juice, red pepper flakes, garlic powder, ginger, half of the red chile peppers and olive oil. Combine well.
Set the chicken thighs on a cutting board and cover with plastic wrap. Lightly pound them until thinned out and flat, making sure not to tear the meat. Add them to the bowl with the marinade and cover. Allow them to sit at room temperature for 25 minutes before cooking.
Preheat a cast iron grill pan or skillet over medium flame. Using tongues, remove the chicken from the marinade and place it on the hot skillet. Turn the flame down to medium low and grill the chicken thighs for a about 3 minutes on each side until nice grill marks form and the chicken is cooked through.
Transfer the chicken to a serving platter, hit it with a good squeeze of lime and serve garnished with the cilantro leaves, lime wedges and remaining red chile slices.
Notes
You can marinade the chicken a day in advance and keep cool in the refrigerator. Make sure to bring it to room temperature before grilling, to ensure even cooking.