Put the flour, baking powder and sugar in a bowl and stir. Gradually whisk in the egg and milk until you have a thick, smooth but spoonable batter.
Heat a non-stick frying pan to medium-hot and brush lightly with oil. Cooking 3 or 4 pancakes at a time, add large spoonfuls of batter to make small, 8cm rounds. Fry until small bubbles appear then flip and cook until golden. Serve warm with butter.