Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper for easy cleanup.
Dice the chicken breast into 1-inch cubes and chop the broccoli, bell pepper, and carrots into bite-sized pieces.
In a small mixing bowl, whisk together the tamari, honey, sesame oil, grated fresh ginger, and minced garlic until well combined.
Place the chicken and vegetables onto the prepared baking sheet, then season with sea salt and black pepper.
Drizzle half of the tamari glaze over the chicken and vegetables, tossing thoroughly to ensure everything is evenly coated.
Spread the mixture into a single layer and roast for 18 to 20 minutes, or until the chicken is cooked through and the vegetables are tender.
Remove from the oven, drizzle with the remaining glaze, and sprinkle with sesame seeds before serving hot.