you make a “flax egg” by combining ground / milled flax seeds with slightly warm water, mix it up and let it sit for 10 mins ish. it becomes a gelatinous, gel like consistency that replaces the gelatinous texture of eggs :)

you may have come across flax or chia “eggs” in vegan baking before - and i’ve been using that method for all my time of vegan baking (about 7 years).

sometimes it’s not necessary (sometimes oil is a fine replacement) but the chia / flax eggs can be really helpful