The month of May brings my birthday and wedding anniversary, so we usually end up making a cake or two. We don't usually do anything fancy. Usually a store-made cake. But this year with the pandemic, we ended up just getting some boxed cakes - Betty Crocker, Duncan Hines. Those sorts of things.

The problem is that they call for eggs and I'm allergic to egg yolks. (Not egg whites, oddly enough - just egg yolks.) So I've found some egg substitute. It works pretty well considering there's no egg in it. But I've found that when I use it in cakes, sometimes they turn out just fine, and other times they end up falling apart.

I know that eggs can be used for flavor, as a rising agent, as a binder, etc. but it's not clear to me how to tell which thing it's being used for in a given recipe. So my question is, in the case of a cake, are there other things I could substitute for egg yolks? The stuff I'm using has potato starch, baking powder, and psyllium husks. I guess the baking powder handles the rising aspect and the psyllium husks are probably like a binder? Are there other things I could be using?