Preheat the oven to 180°C (356°F).
Crumble the Weet-Bix finely.
Cream together the butter and sugar.
Add the egg and mix well.
Add the crumbled Weet-Bix, flour, baking powder, and salt to make a dough.
Fold in the chocolate chips.
Shape the dough into balls and place them on a baking tray.
Bake in a 180°C oven for 12–15 minutes.