Mix 2 tablespoons of grounded chia seeds with 5 tablespoons of water. (rainbowinmykitchen.com)
Egg - free: Since this cake recipe only calls for one egg, I feel pretty good about recommending a «chia egg» (1 tablespoon ground chia seeds + 1 tablespoon lukewarm water mixed and allowed to gel) as a substitution. (glutenfreeonashoestring.com)
If you're egg - free, my favorite egg substitute it a «chia egg» (whisk together 1 tablespoon of ground chia seeds with 3 tablespoons lukewarm water; allow to sit for about 10 minutes or until the mixture gels), so give that a try and let us know how it goes! (glutenfreeonashoestring.com)