Preheat oven to 350 degrees F. Line a cookie sheet with parchment paper.
Melt butter and chocolate together in a microwave-safe bowl (heat on high and stir every 30 seconds). Add instant coffee and beat with a spoon.
Beat in both sugars, then beat in the egg and vanilla (again with spoon, no mixer required). Add the baking powder and salt and mix with the spoon – make sure there are no clumps of baking powder. Add the cocoa powder and stir until it’s mixed in, then stir in the flour and the chips.
Drop by tablespoons onto the cookie sheet and bake on center rack for about 10 minutes – don’t overbake. Overbaking these cookies ruins them. When you take them out of the oven they should be kind of shiny and appear slightly underbaked. Let them cool and set.
Makes about 16 cookies (or so).