Smooth Buttercream Frosting (no Powdered Sugar)

"This Smooth Buttercream frosting is incredibly easy to make. Simply cook a mixture of milk, flour, and sugar, allow it to cool, then blend it with butter. The end result is a velvety, grit free frosting, perfect for piping or to add decorative details. Plus there's no powdered (icing) sugar required. The frosting is light and fluffy, resembling a mix of whipped cream frosting and meringue-style buttercream in both flavor and texture. This classic buttercream, also known as Ermine frosting, boiled milk frosting, or flour buttercream, is smooth and light yet stable enough for intricate piping and supporting large layer cakes. It offers a unique twist on vanilla buttercream frosting, being less sweet and also egg-free. It's the ultimate frosting that pairs perfectly with cupcakes or rich cakes like red velvet, butter, or chocolate."