Place oil in a non-stick pan and cook chicken till cooked through and lightly browned. Add garlic, green onions, water chestnuts, cashews and 1 tsp. soy sauce and cook for two minutes. Add teriyaki sauce and cook on medium-high until sauce began to carmelize a bit on the chicken, stirring frequently. Lower heat to "low" and continue to cook a bit longer or until your desired consistency is reached.