They're basically this recipefrom Live Eat Learn Blog or the exact same recipe with less bloggy commentary at Allrecipes.com but leave out the optional espresso powder/instant coffee. They still taste coffee-ish without it. If I recall correctly, I've also left out most of the oil, or added an extra egg, or drained the beans but not rinsed them, and it didn't make much difference. Next to try: adding some hazelnut meal or chopped walnuts.