Hi Polly, if there's a sugar substitute you enjoy using to make other baked goods, you're welcome to try using it in this cake too. We often tend to opt for reducing the sugar in cake and using less of the real thing rather than using a sugar substitute, but if you'd had good results with a particular ingredient you should feel empowered to use it. If you're looking for a new sugar substitute to try, you might want to start with Truvia or Splenda for Baking. The packages have substitution instructions to help guide you. Good luck! Kye@KAF

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