In a small bowl, add ground chia seeds and water. If need multiple eggs, just multiply the ingredients.
Stir with a fork and let sit for 10 minutes, until the mixture is thick, "gloppy" or congealed.
Notes
Store: Refrigerate in an airtight container for up to 5 days.
Can I use whole chia seeds? No, for chia seeds to thicken in 10 minutes and become an "egg", seeds have to be ground.
How to grind chia seeds: Add desired amount of whole chia seeds to a high speed blender or food processor and grind until powder forms. Do not overprocess into paste.
Expect less volume and rise: Keep in mind that recipes with chia eggs do not rise as much as with real eggs.
Let baked goods cool sufficiently: When you first remove your bread or muffins from the oven, it will appear soft but let it cool for 45 minutes or so (the longer the better for a loaf) before eating or slicing.