In a bowl, add all the dry ingredients and whisk well. Add the butter and rub either between your fingertips or by using a fork until you get breadcrumbs like texture.
Add the egg and mix well then add the milk. Form into a ball.
Flour your working surface. Roll the dough to a ¼ inch thick. Use a round cookie cutter or even a glass will do to cut the rolled dough into rounds.
Heat a griddle or a pan, keep the heat to medium low. Grease the pan with butter and place the welsh cakes on the pan and leave to cook. Each side might take 3 to 4 minutes to cook.
Remove from pan and while warm, dust with castor sugar or confectioners sugar.