How to add potatoes to a recipe?
What should I keep in mind when adding cooked and/or dried potatoes to a recipe that didn't previously call for it? I can assume that if I add instant potatoes to the recipe, it doesn't add to the flour and being dry, doesn't add to the liquid. However, what if I cook and mash whole potatoes? Even if fully drained, there will be an addition of water to the recipe. Is there an easy way to tell how much I'm adding?
Also, how would the addition of potatoes affect the final product? How much is too much?