Piled high frosting in vanilla, strawberry, and chocolate is a wonderful way to bring some Neapolitan into your life!
If your frosting is too thick you can certainly add more milk. I found that this is the perfect consistency for me to pipe roses using the 1M or 2D tip.
On medium speed, beat until smooth and creamy 3-5 minutes. Gradually add remaining sugar 1 cup at a time until desired consistency. You may not use all the sugar.
Place room temperature butter and vanilla into a stand mixer and beat at medium-high for about three minutes. You want it to appear lighter and fluffier.
With mixer off, add in one cup of the powdered sugar and cocoa mixture. Turn mixer on to low and then slowly add in remaining powdered sugar mixture, one cup at a time.