In a large mixing bowl, combine the softened cream cheese and butter. Using an electric mixer, beat these together until they're well-blended (about 2 to 3 minutes on medium speed).

Gradually add in the sifted powdered sugar, vanilla extract, and ground cinnamon. Continue to mix on low speed initially to incorporate the sugar without causing a powdery snowstorm in your kitchen. Once the sugar begins to blend in, increase the speed to medium and beat until fluffy (another 2 to 3 minutes).

Remember, taste as you go! You can adjust the cinnamon or the vanilla.

If you find the frosting too thick, add a tablespoon of milk to loosen it up. If it's too thin for your liking, gradually mix in a little more powdered sugar.

Transfer your frosting into a piping bag fitted with your favorite tip, or simply use a spatula to spread it onto your baked goods.