Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper for easy cleanup.
Cut the chicken breast into 1-inch cubes and chop the broccoli, bell pepper, and carrots into uniform, bite-sized pieces.
Spread the chicken and vegetables across the baking sheet, drizzle with olive oil, and sprinkle with sea salt and black pepper.
Roast in the oven for 18-20 minutes, or until the chicken is fully cooked and the vegetables are tender with slightly browned edges.
While the tray is roasting, combine the tamari, honey, sesame oil, minced ginger, and minced garlic in a small saucepan over medium heat.
Whisk the sauce constantly for 3-5 minutes until it simmers and reduces into a thick, glossy glaze.
Remove the baking sheet from the oven and pour the warm teriyaki glaze over the chicken and vegetables, tossing thoroughly to coat.
Transfer to a plate and garnish with sesame seeds before serving.