Tried these today! Had no espresso powder, nor could I find any at the walkable supermarkets, so I used cocoa powder instead. They came out pretty well, though perhaps a shade on the sweet side. Could the cocoa powder be responsible? My chocolate chips were milk chocolate rather than dark too. Otherwise, next time I suppose I'll just reduce the sugar a little. Milk chocolate will make them very sweet, Michael - and espresso will give them a dark, slightly bitter edge to cut the sweet. Not sure what'll happen if you lower the sugar, as it'll change the texture - but give it a try, and let us know how they come out. Good luck - PJH

• Reply