1Heat oven to 400°F. In ungreased 2-quart casserole, mix chicken, vegetables, soup and 1/2 cup milk. Microwave on High 4 minutes; stir.
2In small bowl, stir Bisquick® mix, 1/2 cup milk and the egg with fork until blended. Pour over vegetable mixture.
3Bake uncovered about 30 minutes or until golden brown.