In a 2-quart mixer with a paddle attachment cream together the butter, shortening and sugars on medium speed until creamy, about 2 minutes. Scrape down the sides of the bowl.
Slowly add the eggs and vanilla on low speed and mix until combined. Scrape down the sides of the bowl. Increase speed to high and whip for 4 minutes.
In a large bowl combine the flour and cornstarch. On low speed, slowly incorporate the flour mixture into the butter mixture. When all the flour is added, mix on low speed for 1 minute.
Pre-heat oven 375*
Line sheet pans with parchment paper.
Fit a large piping bag with a large star-tip. Fill the bag 3/4 of the way full of the cookie dough and form into cookies the size of a quarter, allowing 1-inch between cookies for spreading.
Sprinkle with sanding sugar or sprinkles before baking. Bake 375°F 12-15 minutes, or until lightly brown.
Remove to wire rack to cool.
Home Baking Association
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