Okay, extreme pantry emergency. No cake flour, no cornstarch. What now?
You can try arrowroot powder or potato starch. Same deal—use the same 2 tablespoon swap. It won’t be exactly the same, but it’ll be close enough to fool your guests.
3 Easy Ways to Replace All Purpose Flour with Cake Flour - wikiHow
Or, just use straight all-purpose flour and accept a slightly denser cake. It’ll still taste good. Your coffee won’t judge you.