Preheat oven to 350°F and line a baking sheet with parchment paper.
In a bowl, whisk together flour, cocoa powder, espresso powder, baking powder, and salt.
In a separate bowl, combine sugar, brown sugar, eggs, and vanilla extract.
Gradually add the dry ingredients to the wet ingredients, mixing until a dough forms.
Add melted butter and stir until combined.
Shape the dough into a log about 12 inches long and place it on the prepared baking sheet.
Bake for 25 minutes. Let the log cool for 10 minutes.
Slice the log into 1/2-inch wide pieces using a serrated knife.
Place the slices back on the baking sheet and bake for another 5-7 minutes, or until crispy.
Let the biscotti cool on a wire rack.
Meanwhile, melt chocolate chips and heavy cream over a double boiler or in the microwave.
Stir in coffee granules until dissolved.
Dip each biscotti into the coffee-infused chocolate and let excess chocolate drip off.
Place the dipped biscotti on the cooling rack to set.