Meringue Puff Biscuits

125g butter
1/2 cup icing sugar
1 egg, separated
1/2 tsp vanilla
1 1/2 cups SR flour
salt
1 1/2 Tbs sugar

Cream butter and sifted icing sugar. Add egg yolk and vanilla, beat well. Fold in sifted flour and salt. Work to a firm dough. Roll teaspoons of mixture into small balls. Place on greased oven trays, flatten out slightly. Make a dent in the centre of each biscuit with the top of a wooden spoon. Beat egg whites till soft peaks form, gradually add sugar, beat until dissolved. Carefully spoon teaspoon of meringue into dents of biscuits and spread it a little until it almost covers tops of biscuits. Bake 180C 10-12mins or until golden brown.