Chocolate fudge icing is a smooth and luscious frosting made with butter, cocoa powder, icing sugar, and a touch of milk. Mary Berry’s recipe strikes the perfect balance of sweetness and chocolatey richness, making it ideal for decorating cakes, cupcakes, or brownies.
In a medium mixing bowl, melt the softened butter gently in the microwave or over a double boiler until just melted.
Stir the cocoa powder into the melted butter until smooth and glossy. Ensure there are no lumps.
Gradually sift in the icing sugar, whisking continuously to avoid clumps. The mixture will start to thicken as the sugar combines with the butter and cocoa.
Add the milk one tablespoon at a time, mixing until the icing reaches your desired consistency. It should be thick enough to hold its shape but smooth enough to spread or pipe easily. Stir in the vanilla extract if using.
Spread or pipe the icing onto your cooled cake, cupcakes, or brownies. Work quickly, as the icing will set as it cools.