I have a cake recipe that consists of a dry part, a liquid oil part and eggs. Around half of the dry part consists of sugar. I would like to replace that sugar with liquid stevia concentrate at a very small fraction of the original sugar. If I do that though, then around half of the dry ingredients would be removed from the recipe.
How would I adjust such a recipe? Would I reduce the eggs and liquid oil part proportionally to how much of the dry part has been removed? Anything else that I would need to take into consideration? For example, since the sugar is not soluble in the liquid part, I'm thinking it must also bring certain physical properties to the cake.
I noticed that if I replace the sugar with an erythritol / xylitol blend, then the end result is very similar to the sugar product, so maybe there's a similar bulking agent I could use instead of the sugar? Polyols add sweetness as well, so they wouldn't work in conjunction with the stevia concentrate, it would ideally have to be something neutral.