Preheat your oven to 350 degrees Fahrenheit.
In the bowl of a stand mixer or with a hand mixer cream together the butter, sugar and salt for 3 full minutes on medium speed.
Beat in the milk.
Sift the flour and cocoa into the bowl and mix on low just until combined.
Fit a pastry bag with an Ateco # 826 star tip.
On the underside of the parchment paper draw 12- 1 ½” circles.
Pipe the dough in a circle on the line.
Place the piped cookies in the freezer for 30 minutes.
Bake for 12-13 minutes. Allow to cool on the pan for 5 minutes. Remove the cookies and place on a rack and allow to cool completely.