I found the original recipe on betterbatter.org/egg-yolk-subs titute-vegan and modified it based on what I had on hand - namely a blend of chickpea and all-purpose flour (I was using it in shortbreads anyway which used regular flour so they didn't need to be GF). I was shocked at how wonderfully this worked, once I realized that an electric mixer (hand or stand) is not optional for proper consistency!