Preheat the oven to 180°C (356°F).
Cream the butter and sugar until smooth.
Add the egg and mix well.
Add the flour, baking powder, and salt, and knead into a dough.
Add chocolate chips and mix evenly.
Shape the dough into balls and place on a baking sheet.
Bake in the oven for 12–15 minutes.
Cool and serve.