Prepare the chicken: Cut the chicken into evenly sized bite-sized pieces and pat dry with paper towels.
Season the chicken: Season the chicken lightly with salt and black pepper.
Mix the sauce: Whisk soy sauce, honey, rice vinegar, sesame oil, garlic, and ginger in a bowl.
Make the slurry: Stir cornstarch and cold water together in a small bowl until completely smooth.
Brown the chicken: Heat oil in a large skillet over medium-high heat and cook the chicken for 6–8 minutes, turning occasionally, until browned and cooked through.
Remove the chicken: Transfer the cooked chicken to a clean plate while preparing the sauce.
Simmer the sauce: Reduce the heat to medium and pour the honey teriyaki sauce into the same skillet.
Thicken the glaze: Stir the cornstarch slurry again, add it gradually to the simmering sauce, and cook for 1–2 minutes until glossy and slightly thickened.
Glaze the chicken: Return the chicken to the skillet and toss for 1–2 minutes until every piece is coated with the sticky sauce.
Serve: Spoon the chicken over warm rice and finish with broccoli, green onions, and toasted sesame seeds.