Preheat your oven to 400°F (200°C) and line a sheet pan with parchment paper for easy cleanup.
In a large mixing bowl, combine the soy sauce, sesame oil, honey, grated ginger, minced garlic, rice vinegar, and cornstarch. Whisk together until well combined.
Add the chicken pieces to the bowl, tossing them in the marinade until they are fully coated. Season with salt and pepper to taste. Let it marinate while you prepare the broccoli.
Spread the broccoli florets on the prepared sheet pan. Drizzle with a little sesame oil and season with salt and pepper.
Transfer the marinated chicken onto the sheet pan with the broccoli, spreading everything out in a single layer.
Bake in the preheated oven for 20 to 25 minutes, or until the chicken is cooked through and the broccoli is tender-crisp. Stir halfway through the cooking time for even roasting.
Remove from the oven, sprinkle with sesame seeds, and garnish with green onions if desired.
Serve hot and enjoy your delicious Sheet Pan Teriyaki Ginger Sesame Chicken & Broccoli!