Preheat the oven to 350 degrees F and line two baking sheets with parchment paper. Set aside.
In a medium-sized mixing bowl, combine the flour, cocoa powder, espresso powder, baking soda and salt. Set aside.
In a large mixing bowl, mix the butter with the sugars and vanilla. Once everything is evenly blended, add the egg and mix until the batter is smooth, about 1 minute.
Add the dry ingredients to the wet ingredients and mix only until combined.
Fold in the chocolate-coffee bar chunks and the chocolate chips.
Use a cookie scoop or teaspoon to shape the cookies into approximately 2 tablespoon dollops, about 2 inches apart on the parchment-covered baking sheets.
Bake in the preheated oven just until the cookies solidify, about 10 minutes. They should still look doughy when you remove them from the oven -- they will firm up a bit as they cool. Leave them on the baking sheet for a couple minutes, then transfer them to a cooling rack.