Preheat oven to 375°F. Coat a 9-inch pie plate with cooking spray.
In a large bowl whisk eggs and milk. Stir in rice, zucchini, parsley, salt, pepper and ½ cup cheese. Pour into pie plate. Sprinkle with remaining ½ cup cheese.
Bake 30 minutes or until a knife inserted in middle comes out clean. Let stand 10 minutes before serving.