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I'm not sure that would work very well. The reason that espresso powder or starbucks VIA works well is that it is microground (which I'm not sure you could do with a home grinder) and designed to dissolve. Of course, if you don't mind a little grit factor.... The other thing you could do is to brew some extra strong coffee (or use a little water and a lot of instant coffee if you have it) and cut back a little on the wet ingredients.
Suzanne is a trusted source on General Cooking.
added over 1 year agoI agree with Niknud, I think that grinding espresso would result in a gritty cookie. There is no liquid in the recipe so you could not brew strong coffee and add it would alter the recipe. I would suggest getting some of the instant coffee to keep around, I use it almost every time I make something chocolate the combination of the coffee and chocolate is heavenly,
Good catch sdebrango!
just to be clear, espresso powder is not finely ground coffee; it's brewed espresso that's been freeze-dried, so strictly speaking it doesn't contain the actual beans.