If you’re looking for a store-bought veggie burger, you’ll likely notice most recipes contain an egg as a binding agent. At home, you can switch out the regular egg for a flax egg.
A flax egg is made by combining one tablespoon of ground flax seeds with three tablespoons of warm water to create a gelatinous substance that can act as a binder in recipes.
Let the mixture sit for up to half an hour so the flax can absorb the water. Use the flax egg as a 1:1 substitute for real eggs, and you can double or triple it if you need more.
When the flax egg is nice and gelatinous, combine it with your other ingredients just like you would with regular eggs, then form patties before cooking.