Heat oven to 350℉.
Spray a 9 inch loaf pan with baking spray. Set aside.
In a medium bowl, whisk flour, espresso powder, baking powder, baking soda, and salt together. Set aside.
In the bowl of a stand mixer fitted with the flat beater, combine butter and sugar.
Beat until light and fluffy, about 3-4 minutes, scraping down sides of bowl as necessary.
Add eggs, one at a time, beating well after each addition.
Add vanilla.
Beat on high speed until light and fluffy, about 1-2 minutes.
Add flour mixture alternately with sour cream, beginning and ending with flour mixture.
Stir in coffee.
Stir in chocolate.
Pour into prepared pan.
Bake for 90 minutes, or until cake tests done.
Set aside until cool enough to handle, 15-20 minutes.
Turn out and finish cooling on wire cooling rack.