1Heat oven to 400°F. Lightly grease bottom and side of pie plate, 9x1 1/4 inches.
2Sprinkle zucchini, tomato, onion and cheese evenly in pie plate.
3Stir together remaining ingredients with fork until blended. Pour evenly into pie plate.
4Bake about 35 minutes or until knife inserted in center comes out clean. Cool at least 10 minutes.