Brown sugar frosting brings caramel depth that suits banana cake, while a Greek yogurt topping adds tang and a softer finish. With careful cooling and the right thickness, this two-layer icing sets cleanly and slices neatly.
Essential Concepts
Brown sugar for caramel flavor; Greek yogurt for tang and creaminess.
Cool fully, then assemble.
Adjust thickness with cooling, strain, or a little powdered sugar.