Coconut Milk Powder is much heavier in fat than typical milk powder, with some brands touting 70% oil.  Therefore, it is best for making various concentrations of coconut milk or for a non-dairy creamer.  It may produce heavier results in baked goods, nonetheless, you could give it a try, reducing the fat slightly in your recipe.  Seek out coconut milk powder in Asian markets, and read the label carefully, as some brands to contain sodium caseinate.

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