I've been using this substitute for eggs when I make my Baked Oatmeal recipe and haven't ever really posted it.
For each egg needed:
1 Tablespoon of chia seeds or ground flax seeds (light or dark)
3 Tablespoons of water
Allow mixture to thicken for about 5-15 minutes. Proceed with recipe as usual.
This can be used in other baking applications as well. I have also used flax or chia seeds in my morning smoothies for thickness and overall good nutrition.