Cinnamon rolls are usually made with a sweet glaze of powdered sugar, melted butter, milk (or heavy cream), and vanilla extract. This was the original icing recipe before some cinnamon buns started being topped with cream cheese icing. Pillsbury cinnamon rolls have the original icing in a canister including inside the packaging. The classic Cinnabon cinnamon rolls are topped with cream cheese frosting. Fun Fact: William Lawrence was a dairyman in the 1870s that invented cream cheese frosting accidentally. Thanks to being the first person to mass produce cream cheese, Lawrence discovered how to make the cream cheese icing we all know and love today. National Cream Cheese Frosting Day falls on March 31st of every year.