I have not tested any substitutions with this specific recipe, however there are some general egg substitutes that you can try. 1/4 cup of applesauce or 1/4 cup of mashed banana can serve as an egg substitute. You can also make a flax egg or a chia egg by combining 1 tablespoon of flax seeds or 1 tablespoon of chia seeds with 3 tablespoons of water. If you let it sit for a bit, it will take on an egg-like consistency.