Cut chicken into bite sized pieces. Season with salt and pepper.
Heat 2 tbsp olive oil in a large skillet over medium high heat. Cook chicken turning occasionally until cooked through. Remove from pan.
In a small bowl, combine cornstarch and water to make a slurry. Whisk remaining sauce ingredients in a small bowl. Add cornstarch mixture and stir to thoroughly combine. Set aside.
Add 1 tbsp olive oil and stir fry carrots and peppers until they begin to soften, about 5-7 minutes.
Reduce heat to medium low. Return chicken to skillet. Add sauce and stir to coat.
Simmer 2-3 minutes as sauce thickens.
Garnish with sliced green onions and sesame seeds.