Frosting...made without powdered sugar.

This past weekend I was making a cake with my friend for another friend's birthday, and everything was going well until it came to making the frosting. At my house we never buy canned frosting from the store but instead make our own. As we were gathering the butter and milk for the frosting, I went to get the powdered sugar and found that there wasn't any in the container...it was empty. At first we panicked and didn't know what to do because I have never made frosting without powdered sugar. That is when we decided to search the internet for frosting recipes without powdered sugar. We found a recipe on the website called Tasty Kitchen. It called for flour, milk, vanilla, granulated sugar, and butter. The first step was to combine the cup of milk and 5 tablespoons of flour in a saucepan, stirring it constantly until it became a thick mixture. Then we cooled it until it became room temperature. Once it was cooled, we added one teaspoon of vanilla to the mixture. The next step we did was creamed the butter and sugar in an electric mixer. We had to keep mixing it until it wasn't grainy. Then we added the flour, milk, and vanilla mixture. We beat it on high speed for a very, very long time. It became very light, and almost looked like whipped cream. My friend tasted it and said it was amazing! We frosted the cake with white, but we made some of it green to use for piping. When we gave the cake to my other friend, she liked the frosting as well! When I first realized I didn't have any powdered sugar in the house, my initial reaction was panic, because I couldn't go out and buy any. However, when we went online and found this recipe I realized that it really isn't necessary for a great frosting!
 -Lindsay B.