I feel you can dehydrate potatoes from any kind of cooked potato.
I would say to go for it. Just do it.
Invasive plants are Earth's way of insisting we notice her medicines. Stephen Herrod Buhner
Everyone learns what works by learning what doesn't work. Stephen Herrod Buhner
It's probably just because boiling is much faster than baking and doesn't need an oven. I agree with you that it will be faster to dehydrate after baking.
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the permaculture bootcamp in winter (plus half-assed holidays)