Agree with Emmie about keeping the recommended amount of confectioner sugar in the icing part of the recipe.
But if you want to reduce sugar consumption, there are tips here from King Arthur:
https://blog.kingarthurflour.com/2017/04/26/reduce-sugar-in-cake/
Another way to approach it is to reduce the size of the cake served, and thus of the serving sizes.
For example, here the three round 9" pans accommodate 24 cups volume.
One recipe would fit into six round 6" pans or two rectangle pans (9x13" commonly used for lasagna or other casseroles).
You could make two cakes, serving one first and saving one in freezer or fridge for another occasion.
You could try but I wouldn't recommend it, as the recipe needs an appropriate amount of sugar to be hydrated by the butter and provide fluffiness and structure. Using less sugar may result in an unpleasantly dense, greasy frosting.
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But if you want to reduce sugar consumption, there are tips here from King Arthur:
https://blog.kingarthurflour.com/2017/04/26/reduce-sugar-in-cake/
Another way to approach it is to reduce the size of the cake served, and thus of the serving sizes.
For example, here the three round 9" pans accommodate 24 cups volume.
One recipe would fit into six round 6" pans or two rectangle pans (9x13" commonly used for lasagna or other casseroles).
You could make two cakes, serving one first and saving one in freezer or fridge for another occasion.