In a stand mixer with a paddle attachment, beat butter on high speed until very light and fluffy, about 8 minutes. Add the powdered sugar and mix on low speed until incorporated, then increase the speed to medium-high and beat for an additional 8 minutes. Add vanilla extract, egg nog, and salt and mix on low speed until combined. Best if used immediately.
Recipe by oh honey bakes at https://ohhoneybakes.com/cranberry-vanilla-eggnog-roll-cake/