Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper.
In a mixing bowl, cream together the softened butter and powdered sugar until light and fluffy.
Add the vanilla extract and mix until combined.
In a separate bowl, whisk together the flour, cornstarch, and salt.
Gradually add the dry ingredients to the butter mixture, mixing until just combined.
Transfer the dough into a piping bag fitted with a star tip.
Pipe the dough onto the prepared baking sheet, forming swirls or rosettes.
Bake in the preheated oven for 12-15 minutes until the edges are lightly golden.
Remove from the oven and let cool on the baking sheet for a few minutes.
Transfer to a wire rack to cool completely before serving.