Add water, potato, onion, carrot and celery in 2-quart casserole; cover.
Microwave at HIGH (100%) until potatoes are tender, 12 to 17 minutes, stirring after half the cooking time.
Stir in consomme and half-and-half; cover.
Microwave at MEDIUM-HIGH (70%) until heated through, 6 to 8 minutes.
Mix in cheese, stirring until melted or use 2 teaspoons instant chicken bouillon dissolved In 1 cup hot water.