Step 1

Preheat oven to 350°F.

Step 2

In a medium bowl, sift together the flour, baking powder, and salt. Set aside.

Step 3

In the bowl of a stand mixer, cream together butter, confectioners' sugar, and granulated sugar on medium speed for at least 2 minutes, scraping down the sides as needed.

Step 4

Add the egg, vanilla, and milk and blend until smooth and fluffy (about 30 seconds).

Step 5

Add the flour mixture and mix on low until fully incorporated.

Step 6

Chill the batter for 10-15 minutes.

Step 7

Scoop 1/2 teaspoon-sized dollops of the batter (about 1 inch apart) onto a baking sheet lined with parchment.

Step 8

Bake 12-15 minutes, rotating pan halfway through baking. Cookies will be golden brown.

Step 9

Allow to cool completely before serving.