Wash the strawberries thoroughly and cut them into small pieces.
Leave the butter at room temperature until softened.
Cream the sugar and butter together, then add the egg and mix well.
Sift in the flour and baking powder, and make a dough.
Shape the dough into balls, place them on a baking pan, and press the center to make an indent.
Fill the indent with strawberry jam.
Bake in a preheated oven at 180°C (356°F) for 15 minutes.
Let cool and enjoy.