Preheat metal tray with baking sheet in oven for 10 minutes at 190°C

Melt butter, allow to cool. Add egg and lightly whisk

Combine flour, sugar, baking powder and choc chips in large bowl. Mix well. Stir in butter mixture and mix until dough is formed

Remove preheated oven tray and work quickly placing tablespoon of dough on tray and press a little. Allow room for slight spreading

Bake for 12-15 minutes before placing on cooling rack