Preheat the oven to 325F
Line a cookie sheet with parchment paper, line two if you have them. If not, be prepared to use the same sheet twice with a clean sheet of parchment
In the bowl of a stand-mixer fitted with a paddle attachment, add the butter and the sugar. Beat on medium speed until light and fluffy- about 4 minutes. Scrape down the sides of the bowl with a non-stick spatula. Add in the vanilla and mix again.
Scrape down the sides of the bowl once again and add in the flour, cornstarch and salt. Mix until thick dough forms
Add in the heavy cream and mix until completely combined. Scrape the dough from the bowl and any excess on the paddle attachment and place into a piping bag fitted with a star tip.
Using even pressure, hold the bag upright and create a circle with the dough, making sure not to leave a large gap in the center. Bake for 12-15 minutes until edges are slightly browned. Remove from oven and let cool.