In a small bowl, whisk together honey, soy sauce, rice vinegar, garlic, ginger, and red pepper flakes. Set aside.
Season the chicken chunks with salt and pepper.
Heat olive oil in a large pan over medium heat. Add the chicken and cook for 5-7 minutes, or until browned and cooked through.
Pour the honey garlic sauce over the chicken, stirring to coat evenly. Let it simmer for 5 minutes until the sauce thickens.
Garnish with sesame seeds and cilantro if desired.
Serve over steamed rice or with your favorite side dishes.