Put the flour and milk in a mixing bowl, then crack in the egg and whisk until you make a smooth batter.
Blitz the sweetcorn and feta in a blender, then add to the batter and whisk to combine.
Put a frying pan on a medium to high heat and add a knob of butter. Once your pan is hot and the butter has melted, put a couple dessertspoons of the batter in the pan. Cook until little bubbles start to show on top of the pancakes, then use a fish slice to flip them over and cook for a further 1 to 2 minutes, until golden.