
This cookie cake frosting is perfect for all your cookie cake needs! It's easy to make, simple to pipe, and it hardens beautifully!This recipe makes roughly 1 ½ cups of frosting; enough to add a border & message to a 12" round cookie cake. For layered or larger sizes, use the amounts in my Sheet Pan Cookie Cake or Layered Cookie Cake!
Beat the softened unsalted butter (½ cup, i.e. 1 stick) on medium-high speed for 2 minutes until smooth.
Turn the mixer to low speed then add the powdered sugar (1/4 cup at a time, 2 ½ cups total). You may need to stop and scrape down sides.
Add vanilla extract (2 teaspoons) and salt (⅛ teaspoon) and turn mixer to medium speed. One tablespoon at a time, add milk (2-3 tablespoons). Beat on high for 2-3 minutes until creamy and the frosting is at a good consistency to pipe.If it looks too runny, add more powdered sugar. If it looks too stiff, add a tiny bit of milk until you get to the desired consistency.
If adding sprinkes, be sure to add them right way before the frosting hardens.
See notes below for storing instructions.