In a mixing bowl, cream together the softened butter and caster sugar until light and fluffy.
Add the egg and vanilla extract to the creamed mixture. Mix until well combined.
Sift in the plain flour and add a pinch of salt. Mix until a dough forms.
Transfer the cookie dough into a piping bag fitted with a star tip.
Preheat the oven to 180°C (160°C fan/ Gas mark 4).
Pipe the dough onto a baking sheet lined with parchment paper, leaving some space between each cookie.
Bake in the preheated oven for 10-12 minutes, or until the cookies are lightly golden around the edges.
Allow the cookies to cool on the baking sheet for a few minutes before transferring them to a wire rack to cool completely.
