I've used just half an egg in this recipe as this still makes enough corn fritters to serve 4 people easily - just whisk an egg and carefully add half of it to the mix (I typically use the other half in a Thai noodle dish such as Pad See Ew to serve at the same time). You can, of course, double the recipe and use a whole egg if desired. The corn fritter batter will keep in the fridge for 24 hours if you'd prefer to prepare the night before.