Beat softened butter or baking block with sugar. Mix in egg and vanilla.
Stir together flour, baking powder and salt, then combine with the wet mixture and chocolate chips. Chill for 30 minutes.
Heat a conventional oven to 175 °C. Divide into 12 portions on lined trays, leaving room to spread.
Bake for 12–15 minutes until the edges are set. Leave on the tray for 10 minutes before transferring carefully to a rack.
Make it work for you
Check that all packaged ingredients are suitable for your dietary needs. Lactose-free dairy still contains milk proteins; use suitable plant-based alternatives if you need to avoid dairy.