Preheat the oven to 180°C (356°F).
Cream the butter and sugar together in a bowl.
Add the egg and mix well.
Sift in cake flour, baking powder, and salt; gently mix.
Add sliced almonds and mix evenly.
Drop spoonfuls of dough onto parchment paper.
Bake in the oven at 180°C for 12-15 minutes.
Cool on a wire rack.