Light and fluffy, Healthy Buttercream Frosting is what any cake or cupcake needs to make it perfect. It's an ermine icing made with flour, sugar, milk and butter, whips up silky smooth and does not taste overly sweet!
While whisking, slowly add milk. Keep whisking. Cook until mixture thickens into a roux, stirring all the time. Turn off heat and let cool in the pot uncovered for 20 minutes.
The frosting itself is best used immediately – most fluffy. On a warmer day, frosting will hold at room temperature for about 1 hour. On colder days 3-4 hours – remove from the fridge 1 hour prior to serving to let frosting warm up.