chocolate choc chip biscuits

125 g butter
1/2 cup brown sugar
1/3 cup castor sugar
1 teaspoon vanilla e
an egg
1 1/2 cup SR flour
1/3 cup cocoa
3/4 cup choc chips

1,mix butter and sugars
2, add vanilla and egg
3, add flour and cocoa
4, choc chips

bake at 160 for 10-15 min