I think MJ's was chia gel for the egg - not sure of the ratios though would have to try and find it ... hence the good idea of a separate section
It was Linseed Gel and here's some others:
2 tbsp cornstarch = 1 egg
2 tbsp arrowroot flour = 1 egg
2 tbsp potato starch = 1 egg
1 heaping tbsp soy powder + 2 tbsp water = 1 egg
1 tbsp soy milk powder + 1 tbsp cornstarch + 2 tbsp water = 1 egg.
1 banana = 1 egg in cakes.
1 tbsp milled flax seed and 3 tbsp water = 1 egg. Light, fluffy cakes!