Whisk together the flour, baking soda, baking powder, and salt.
Use a hand mixer to cream together the butter and sugar until smooth and fluffy.
Add an egg and vanilla and mix until combined.
Pour in milk, and mix until combined.
Add the flour mixture to the wet ingredients and mix until just combined.
Using a 1.5 tablespoon cookie scoop, scoop out the cookie dough onto a parchment-lined sheet tray. Chill for at least 2 hours.
Roll the cookie dough balls between your hands to form a smooth ball.
Dip the tops of the dough balls into the decorator’s sugar.
Place them, sugar side up, onto the parchment-lined sheet trays about 2 inches apart.
Bake for 8-11 minutes until lightly golden brown around the edges.
Let the cookies cool on the tray for 10 minutes, transfer to a wire rack to cool completely.
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