Chicken and Veggies Stir Fry

Slice the chicken into half-inch strips. Rub with a pinch of each of salt and pepper. In a bowl, mix water,sugar, chili garlic sauce, vinegar, and oyster sauce until sugar is dissolved. Set aside. Heat a non-stick pan over high heat  and add 1 tbsp oil or butter, swirling pan to coat evenly. Stir-fry onions and garlic until golden and caramelized. Add the chicken strips until just cooked. Do not brown. Transfer chicken and onions to a bowl. Add the remaining oil to the pan and heat until smoking, then stir-fry vegetables for three to four minutes.  Add the mixture from step 2 to the pan over medium heat. Add cornstarch solution. Simmer and add chicken mixture and stir-fry until heated through and sauce thickens.Serve hot over cooked rice.