So sorry I don't have pictures for this guide! I was so involved in making the frosting that I forgot to take pictures! 😋
Cream butter and shortening together until smooth, approx 3 minutes using a paddle attachment.
Slowly add sugar, once all added crank up speed on mixer to med- high and whip it up for approx 1 min.
Add milk, depending on your liking: stiffer~ less milk, creamier ~ more. If you add too much, no worries, just sift in a little more sugar.