Preheat oven to 375°F.
Cream together butter and sugar using your mixer of choice, taking breaks as needed to scrape down your bowl.
Once fully combined add in eggs one at a time. Mixing until you can't see the streaks of egg anymore.
In a separate bowl, whisk together combine flour, cornstarch, and salt.
Slowly, add your dry ingredients to your mixer. Mix on medium-low for about 5 minutes, the mixture will seem too dry to ever come together at first but give it time and it will come together I promise!
Add in vanilla. Once it starts to pull away from the sides and form a ball you know it is ready.
Spread out some parchment paper on your counter and begin rolling out your dough on the parchment. No extra flour is needed. Roll to about ¼" thickness.
Cut your dough into whatever shapes you choose.
Place shapes on a baking sheet and bake for 9 to 12 minutes. Mine usually are done closer to 9 minutes.
Once completely cooled they are ready to eat or ice with your icing of choice!