Do you have access to instant mashed potato flakes, Alba? If so, the same amount by weight or double by volume can be used in place of the potato flour. We didn't test a version using mashed potatoes themselves, but using the starchy water left over after boiling potatoes (for the lukewarm water called for in the recipe) can have the same tenderizing effect. If none of these are options, you can leave the potato flour out - you just lose a little bit of the extra tenderness when you do. Mollie@KAF

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