Preheat your oven to 375ºF and line two baking trays with parchment paper.
Add the sugar, butter, and salt to a bowl and cream them together with an electric mixer until light and fluffy. You want the butter and sugar mix to be almost white so beat for about 5 minutes.
½ cup granulated sugar, 10 Tablespoon butter, ¼ teaspoon salt
Add the egg, milk, and vanilla and stir well to combine.
1 egg, 1 Tablespoon milk, 1 teaspoon vanilla extract
Add ½ cup of cake flour and stir gently. Add another ½ cup of cake flour and stir again. Add the final ⅔ cup of cake flour and mix into a thick, sticky batter. Adding the flour in parts ensures that the cookie dough is not over-mixed and stays nice and soft.
1 ⅔ cups cake flour
Scoop the cookie dough into a large piping bag fitted with a large star tip. Pipe the cookies onto the parchment-lined trays. You can pipe the cookies into any shape you’d like. Spirals/rosettes are the most classic shape! No matter what shape you choose, try to keep the cookies about 2” in size.
Bake the cookies for 10 minutes. The edges will be slightly golden brown but the cookies will still be a little pale in the center.
Let the cookies cool on the tray for 5 minutes then move to a cooling rack.