- Using a handheld or stand mixer, beat butter until light and fluffy. About 2-4 minutes.
- Scrape down the bowl and add all of the powdered sugar.
- Mix on low until incorporated. Scrape down bowl.
- With mixer on medium low, add 1/2 teaspoon salt, vanilla extract, and ground cinnamon. Add the heavy cream 1 tablespoon at a time.
- Turn mixer to medium-high and beat until fluffy. About 2-3 minutes.