i don't know anythign about egg replacements, i'm afraid, i hope someone will be along soon to help, but i know i never put egg in burgers (because i find the idea of raw egg and raw meat squished together kinda icky) and mine never fall apart. I think if you use the extra lean stuff that mostly everyone buys now, you don't need a binder, it was just back in the 70s when the meat was fattier that it fell apart. i put cheese in these because i like it, but they are lovely without.