In a medium bowl, whisk together honey, soy sauce, rice vinegar, garlic, ginger, cornstarch, sesame oil, red pepper flakes (if using), and black pepper until smooth.
Add chicken breasts to the marinade and cover. Refrigerate for at least 30 minutes (ideally 2-4 hours).
Heat vegetable oil in a large skillet over medium-high heat. Cook chicken for 5-7 minutes on each side until cooked through (internal temperature of 165°F).
Remove chicken from skillet and let rest for a few minutes before slicing.
Simmer leftover marinade in the skillet until thickened (about 2-3 minutes).
Slice chicken against the grain and drizzle with the thickened sauce before serving.
Helpful Notes:
Nutrition
Serving Size:1 chicken breast (approximately 150g)