Preheat your oven to 400°F and line a large sheet pan with parchment paper for easy cleanup.
In a small glass jar, whisk together the tamari, honey, sesame oil, grated ginger, and minced garlic until well combined.
Place the cubed chicken breast, broccoli florets, sliced bell pepper, and snap peas onto the prepared baking sheet.
Sprinkle the sea salt and black pepper over the chicken and vegetables.
Pour half of the prepared teriyaki sauce over the ingredients and toss thoroughly to ensure everything is evenly coated.
Spread the mixture into a single layer and roast for 15 to 18 minutes, or until the chicken is cooked through and the vegetables are tender-crisp.
Remove from the oven, drizzle with the remaining sauce, and garnish with sesame seeds before serving.