Add ground turkey to a nonstick frying pan and brown on medium heat. Once your turkey is half way done browning, add your diced vegetables and stir.
While your turkey and vegetables are cooking, prepare the teriyaki sauce by mixing cornstarch and 1/4 cup water in a small bowl. Whisk until corn starch is dissolved. Add all the teriyaki sauce ingredients to a saucepan, adding corn starch mixture last. Whisk together until combined and simmer on low to medium-low heat until sauce thickens.
Once sauce has thickened, remove it from the heat and add to the frying pan with the turkey and vegetables. Let the teriyaki turkey mixture simmer on medium-low heat for five to ten minutes.
Top your rice with your teriyaki turkey and sliced green onions and enjoy!