Russian Buttercream is a delightful frosting made from two ingredients - condensed milk and butter! It has a smooth and fluffy texture that is surprisingly not overly sweet.
Make sure both the butter and condensed milk are at room temperature. Leave butter out of the refrigerator for at least 30 minutes
Place room temperature butter into a mixing bowl and use the whisk attachment. Whip the butter until it turns white, which will take about 5-10 minutes on high speed.
Slowly add in the condensed milk. Stop once it has all been added and is well blended. Use it immediately by spreading on a cake or filling a piping bag.
Once the cake or cupcakes have been decorated, store them in the refrigerator until right before consumption.