Cut up butter, let sit at room temp for a while (I usually cut in the morning and mix around dinner time!)

Combine egg whites, powdered sugar, salt, in your mixer, mix about 5 minutes. Add white food coloring!

Begin adding your pieces of butter (1-2tbs at a time) if it begins to look curdled, you are doing it right! Just keep mixing!!

Once all butter is fully incorporated (about 15 minutes)

Add the 2 tbsp vanilla extract.

Continue to beat 10 more minutes.