Preheat oven to all180 deg. Grease and line 2 baking trays with baking paper.

Using an electric mixer , beat butter and sugar in a large bowl until pale and creamy. Add egg and vanilla, beat until well combined. Stir flour into butter mixture ,mix until combined and a soft dough forms.

Roll heaped tablespoons of dough into balls. Place on prepared trays,about 3cm apart for spreading. Flatten slightly, bake for about 10-12 minutes or until lightly golden. Remove cookies from oven . Cool on trays with(cookies will firm). serve