Over medium heat, combine all sauce ingredients in a saucepan and whisk to combine, until bubbly.
Add all chopped veggies & cubed chicken to sheet pan. Drizzle about 3/4 of the sauce onto veggies and chicken and toss to coat evenly. Season with salt and pepper.
Bake in the oven at 375 for 25-30 minutes.
One chicken is fully cooked through & veggies are tender, take out and drizzle the remaining sauce & top with sesame seed and chopped green onion.