Chocolate Shortbread

Ingredients-
125g butter - softened
1 cup caster sugar
1tsp vanilla essence
1 egg beaten
2 tbls cocoa
1 1/2 cups SR flour
Sifted icing sugar or 90g white milk or dark chocolate melted to decorate.

Method -
1.  Preheat oven to 160c Line 2 baking trays with baking paper.
2.  Place butter, sugar and vanilla in a bowl.  Beat until light and fluffy.  Add egg and beat until creamy.  Add cocoa and flour: stir well to combine.
3.  Drop rounded teaspoons of mixture ont mounds on trays, allowing room for spreading.  Bake for 10 mins.  Cool on trays until firm: transfer to wire rack to cool.