Beat softened butter on medium speed with a stand mixer. Beat for 3 minutes until smooth, creamy and lighter in color. Add powdered sugar, cream, and vanilla extract. Mix on low to incorporate then increase to high speed and beat for 3 minutes until light and airy. Note: If the frosting is too thick, add a little more cream. Just add one tablespoon at a time, then mix thoroughly until you get the consistency you like.