Preheat the oven to 350°F.
In a medium bowl, cream together the butter, powdered sugar and vanilla until smooth.
Mix in the flour and cornstarch until fully combined.
If using, add in the food coloring to your desired shade. Place the dough in your cookie press, and press the cookies out on an ungreased baking sheet.
Bake in the preheated oven for 8 to 10 minutes.