>> source: https://www.fifteenspatulas.com/butter-swirl-shortbread-cookies/
>> serves: 24 cookies
>> total time: 25 minutes

Preheat the oven to 350°F.

Place the @unsalted butter{1%cup}, @confectioners' sugar{114%g} and @vanilla{1%tsp} in a #large bowl{}, and beat with an #electric mixer{} until combined, light, and fluffy.

Add the @all-purpose flour{240%g} and @salt{1/2%tsp} and mix until it’s crumbly and looks like it can’t be mixed more.

Add the @whole milk{1%Tbsp} and keep mixing. The dough should clump together after about ~{15%seconds}.

Place the dough into a #pastry bag{} fitted with a very #large star tip{}, and pipe onto a silicone mat lined #baking sheet{}, with no more than 12 cookies per sheet.

Bake the cookies for ~{15%minutes} or until lightly golden.

Let them cool completely (on the tray is fine), and enjoy!