Combine and stir all ingredients for the marinade in a medium saucepan over medium heat except for the corn starch slurry.
While the marinade is coming to a boil combine the diced chicken, zucchini, pineapple, bell pepper and onion in a large bowl.
Once the marinade has to come to a boil and is well combined pour half over the bowl of chicken and veggies to coat them.
Put the coated veggies on a sheet pan and put in the oven for 20 minutes until the chicken bites register above 165 degrees. Watch carefully as not to overcook the chicken.
Once chicken is in oven bring the remaining marinade back to simmer and stir in corn starch slurry. Once thickened remove from heat.
Once chicken is fully cooked remove from oven and garnish with cilantro, peanuts and green onions as well as additional thickened teriyaki sauce.