Melting Moments Cookies

salted butter, room temperature (1/2 cup + 1 tablespoon)

powdered sugar (5 1/4 tablespoons)

pure vanilla extract, (optional)

potato starch (preferred) or cornstarch (3/4 cup + 1 1/4 tablespoons)

cake flour (3/4 cup + 2 1/2 teaspoons)

Powdered sugar for dusting cookies