02Cover tightly with microwave plastic wrap. Cook at 100 percent power in a high-power oven for 10 minutes. While dish is cooking, stir cornstarch and water until smooth.03Prick plastic to release steam. Remove from oven and uncover. Spread scallions and pour cornstarch mixture over vegetables. Use a spoon to mix them into the cream as well as possible without disturbing the chicken. Re-cover and cook for 5 minutes. Prick plastic to release steam.04Remove from oven and uncover. Mix in pepper and serve.