I'm tweaking a thin sponge cake with nut flour that I want to roll with a filling. My third attempt at the cake was delicious, but it didn't bake evenly. The edges were dry and there was a slightly sunken, dry section in the middle. The sections that weren't dry were great! I'm using a half sheet pan that's quite thin and may be a bit warped. I have another one just like it. Could it possibly help to nest the two pans to create an insulated baking environment?
There are a couple of things that can lead to uneven heating in an electric oven. Here a couple of things that can help.