Preheat oven to 350 degrees F. Spray cookie sheet with non stick baking spray.
In a large bowl, cream butter, white sugar, and brown sugar. Stir in baking powder, espresso powder, and salt.
Stir in cocoa powder. Add flour a little at a time until just combined. Do not over mix.
Fold in chocolate chips.
Scoop cookie dough on prepared pans. Bake for 8-10 minutes just set. Do not over mix. Cook on cookie sheet for 2-3 minutes before moving to a wire rack.
Notes
For the best flavor, use high-quality espresso powder. You could substitute instant coffee in a pinch, but the flavor will not be the same.
Use natural, not dutch processed cocoa.
I used Nestle Espresso Chips, found at Target. If you can't find them, you can use semi-sweet or dark chocolate chips instead.
Store in an airtight container for up to 7 days.
Freeze baked cookies or cookie dough for up to 3 months.