Season the chicken with salt, pepper, and garlic powder; set aside.
Heat a pan or skillet over medium-high heat; sear the chicken thigh fillets or breast fillets on both sides until golden and cooked through.
FOR BONE-IN THIGHS:
After searing on both sides, reduce the heat, cover the skillet with a lid, and continue cooking the chicken until fully cooked, turning every 5 minutes until done. Alternatively, refer to the notes for the oven method.
Drain most of the excess oil from the pan, leaving about 2 tablespoons of pan juices for extra flavor.
FOR THE SAUCE:
Once the chicken is cooked through, arrange it skin-side up in the pan (if using skin). Add the garlic between the chicken and fry for about 30 seconds until fragrant. Then, add the honey, water, vinegar, and soy sauce. Increase the heat to medium-high and cook the sauce until it reduces and thickens slightly (about 3-4 minutes).
Garnish with parsley and serve over vegetables, rice, pasta, or with a salad.