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Yes, you can use it when combined with milk or heavy cream, but try to find a recipe specifically using an egg replacer rather than just adjusting a quiche recipe with eggs. Here's a link to the company website, which has lots of recipes, including quiche:
You may know this already, but if not, 1/2 tablespoon of Ener-G Egg plus 2 tablespoons of water equals one egg.

