Preheat the oven to 200 ° C and grease the baking sheet well.
Whisk the egg. Mix the flour, baking powder and sugar in a mixing bowl. Mix the butter into the flour with your fingers until the batter looks like breadcrumbs. Make a well in the middle and pour in the milk. Mix everything into a slightly sticky dough. Roll out the dough approx. 2 cm thick and cut out scones with a tea glass (diameter approx. 5 cm). Place these on the baking sheet, brush with egg and bake for about 15-20 minutes.