I always make a double or triple batch of these biscuits because otherwise there would be none left when the kids get home from school.
1 1/3 cups of plain flour
1 Tsp baking powder
125g butter
1 cup sugar
2 eggs beaten
1 1/2 tsp vanilla
Preheat oven to 180 degrees. Cream butter and sugar.  Add eggs and vanilla. Fold in combined flour and baking powder. (At this point you can add nuts, fruit, choc bits or M&Ms).
It is a difficult mixture to shape so just drop teaspoonfuls on to baking paper and bake for about 8 mins or until slightly browned at base.