I adopted the recipe from here. I prefer vanilla cupcake so I used 100g self-rising flour instead of 75g flour + 25g cocoa powder and castor sugar instead of brown sugar.
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I followed the method for making the frosting but I couldn't get the correct texture, so I spread the frosting onto the cupcakes instead of piping, but I really would like to try to pipe pretty frosting onto my cupcakes one day.
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The frosting has the correct sweetness that I like, and the crispy base is a brilliant idea. Simply yummy~