I love a pistachio bundt cake that I make for company but I only keep sugar free instant on hand. Is it just for bulk that you specified using regular and not sugar free pudding mix? Otherwise I'll have to pick up some of the real deal. :) Kelly, it's for the starch - it keeps the shortbread tender. You can certainly try the sugar-free - not sure how much (volume) the box holds. Try adding 3 tablespoons cornstarch with the sugar-free, I'm betting it'll work just fine. PJH

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