1. In 1 1/2-quart microwave-safe casserole combine broccoli, onion and water. Cover and heat at high about 2 minutes or until vegetables are crisp-tender. Drain well.
2. In large bowl combine egg white, undrained corn, 3/4 cup of the KEEBLER CLUB Multi-Grain crackers, 1/2 cup of the cheese, milk, thyme and pepper. Stir in broccoli mixture.
3. Spoon vegetable mixture into 1 1/2-quart casserole coated with cooking spray. In small bowl combine remaining 1/4 cup crackers and remaining 1/4 cup cheese. Sprinkle over vegetable mixture. Bake, uncovered, at 350°F about 40 minutes or until a knife inserted in center comes out clean. Let stand for 5 minutes.