Add softened Grassland butter into a standard mixer and beat until light. Add powdered sugar and mix on low until incorporated
Add vanilla to butter/sugar mixture, and continue to beat on low.
Add in milk, and beat on medium speed until frosting has become thinner and more creamy.
Add Cinnamon. Mix on low until the Cinnamon is completely incorporated. The frosting should be dotted with cinnamon sugar.
Once combined, transfer the mixture to a piping bag to add to your favorite treat. We tried a traditional holiday babka.
