Beat egg whites until stiff. Set aside.

When chocolate chips are melted, add yolks one at a time, whisking vigorously after each addition. Remove from heat and add dissolved coffee and cocoa mixture and the peanut butter. Whisk vigorously to combine.

Spoon one cup of beaten whites into the chocolate mixture and fold together. Pour the mixture back into the whites and fold again until fully incorporated.

Melt chocolate chips in a double boiler. 

Meanwhile, dissolve the coffee in the boiling water, then add the cocoa powder immediately and stir to dissolve.