Instructables
Picture of Using flax seed as an egg substitute
There are several instructables that mention using flax seed as an egg substitute.  For a comprehensive view of different ways to replace eggs, I recommend this one:   http://www.instructables.com/id/Egg-Substitutes/

Flax is a great substitute for egg in dense baked goods, like cookies, brownies, and pancakes.   This little instructable shows how to prepare the flax step by step with pictures and video.

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Step 1: Grind the flax seeds

Picture of Grind the flax seeds
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You can start with ground Flax Seed meal or whole flax seeds.   The whole seeds stay fresh longer so I always have them on hand. Also I use "golden" flax seed because it's less visible when mixed into batter, but the dark seeds will work just as well.  If you're using ground flax meal you can skip to the next step. 

If you're grinding flax seed from scratch you'll need a spice grinder or a coffee mill.  This is a coffee mill that I use for spices and never for coffee, because coffee has a strong flavor.  If you already have a coffee grinder and you want to use it for flax seed or other spices: wash out the inside with warm soapy water; rinse to get rid of the soap; then rinse with a little white vinegar.  There should only be a faint smell of coffee left.

Once you have a clean dry grinder, simply put the flax seeds in and grind for about 30 seconds.  I find it grinds better if there's at least two tablespoons of seed, so I may end up with more than the recipe calls for.
bajablue2 years ago
What an interesting Instructable! I've never heard of substituting egg with flax.

Thank you for sharing!!!
ChrysN2 years ago
Nice, I tend not to have eggs at home but I do have flax seed, so this is great if I have a sudden urge to make cookies.