Hi Barb, thanks for the reply (and apologies for taking 3 months to realise!).

So just to summarise numerically the first approximation would be to replace every 1g of potato flakes with 3.5g of mashed potato, and cut liquids by 50%.

A minor clarification - I assume that means all water-based liquids (like water, milk, orange juice), but would the quantity of, say, eggs or oil remain the same?

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