Can I substitute any sugar for sweetener in any cake recipe??

[Panda.Bear.Hugs]

My cousin just bought me the "Cupcakes from the Primrose Bakery" recipe book and I would love to try all the recipes out! But I quickly calculated the amount of syns for the ingredients and it went up to a staggering 24 syns per cupcake (and even the lamest vanilla cupcake with vanilla frosting).

I've already switched the full-fat butter for reduced fat and the syns have gone down, but can I switch the sugar for sweetener (splenda) and keep the same taste?

 

[Legomom]

You just can't make icing or buttercream with sweetener I've tried lol

 

[Panda.Bear.Hugs]

You just can't make icing or buttercream with sweetener I've tried lol

Oh no! That's annoying! I thought it would be alright because the consistency of sweetener is the same as the one of icing sugar