What kind of wash can I use to give my vegan challah a nice shine? I've tried suggestions I found elsewhere: water, oil, corn starch. None of them shine like egg whites
Non-diastatic malt powder gives baked goods better flavor and a shinier, browner crust. It's used in everything from bagels to croissants to breakfast cereals. It can be found online at King Arthur.
In addition I use a butter flavor cooking spray (I like the Crisco brand), spray on before baking and again right out of the oven – attached an example of a bread I baked using the cooking spray...crisco brand gives shine and a nice extra flavor.