In a bowl, combine all the ingredients for the stir-fry sauce and set aside.
In a large skillet, over medium/high heat, heat 1 Tbsp oil. Once hot, add the chicken and saute until chicken is browned, stirring as needed. Once cooked, remove the chicken from the pan and cover to keep warm.
Add the remaining oil and the butter to the skillet. Add the zucchini, broccoli, onions, mushrooms, red peppers, and carrots. Cook until vegetables are tender, stirring as needed.
Return the chicken to the pan. Add the garlic and ginger, and cook 1 minute.
Add the cashews and pour the sauce into the skillet and bring to a soft boil.
Turn the heat down and allow the stir fry to simmer until the sauce thickens and is well incorporated, stir often. Garnish with sesame seeds and green onion.
Serve, and enjoy friends!