• Preheat your oven to 350°F. Line a baking sheet with parchment paper and set aside.

Prepare the Cookie Dough

• Using a hand mixer, or stand mixer, cream butter and sugar together until light and fluffy. Add in vanilla and egg, and mix until well combined.
• Take out two medium-sized size mixing bowls, and using a sifter, sift together flour, baking soda, baking powder, salt, and cornstarch, alternating between the two bowls until the flour mixture has been sifted 3 to 4 times. The flour should have a powder texture.
• Gradually add the dry ingredients into the wet ingredients until blended. Scrape down the sides of the bowl as needed.

Cut Out and Bake the Cookies

• Roll out the dough to ¼-inch thickness. Use a circular cookie cutter to cut out each cookie.
• Place cookies on a prepared baking sheet and leave 2 inches between each cookie.
• Bake for 7 to 9 minutes, until edges are lightly golden
• Remove from the oven and set aside to cool.

Frost the Cookies

• To make the frosting, beat the butter and powdered sugar until light and fluffy
• Beat in the vanilla, milk, corn syrup, and food coloring until the frosting is smooth and spreadable.
• Once cookies have cooled completely, spread frosting onto each cookie and then top with sprinkles.