Beat eggs with sugar and water in a microwave safe medium bowl. Microwave on High for 1 minute. Stir in vinegar, dry mustard and pepper; microwave on High for 1-1/2 to 2 minutes, whisking at half time during cooking; set aside. Toss spinach with mushrooms, celery, tomatoes and cucumber. Divide among six dinner plates. Top with an equal amount of chicken slices and egg wedges. Drizzle with warm dressing.
* Spinach leaves can be wilted and drained.
Recipe tested in a 650-watt microwave oven.