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Welcome Gwynne, I personally don’t use the recipes in the book, but I see no reason why you can’t swap one milk substitute for another. Just check the calorie and carb content in you chosen product, so you can calculate them in the bircher you make.
Do join in on other threads, the weekly one is a good one to be part of, as it’s populated by old hands and newcomers. Good place to ask questions and gain advice, encouragement and support.
Best wishes and hope to see you out and about on the forum.
Hi Gwynne, I have used almond milk in Bircher recipes and it works well, so I don’t see why oat milk wouldn’t.
If you need a substitute for coconut milk in recipes where the coconut taste is important to the recipe (eg in Thai curry for example), I have used evaporated milk with coconut essence before and it works well – a few drops of coconut essence per cup of milk.