Preheat oven to 325°F. Coat a loaf pan with nonstick cooking spray and line it with a parchment paper sling. Spray again to coat the parchment and set aside.
In a large bowl, whisk the flour, cocoa powder, baking powder, baking soda, and salt together. Set aside.
1½ cups cake flour, ½ cup unsweetened cocoa powder, 1 teaspoon baking powder, ¼ teaspoon baking soda, ½ teaspoon kosher salt
In a liquid measuring cup, whisk the espresso powder and water until dissolved. Set aside to cool.
1 teaspoon espresso powder, 10 tablespoons water
In the bowl of a stand mixer fitted with the paddle attachment, beat the butter and brown sugar until light and fluffy, scraping down the sides as needed.
10 tablespoons unsalted butter, 1¼ cups brown sugar
Add in the eggs, vanilla, and mix until combined, continuing to scrape the sides of the bowl as needed.
3 large eggs, 1 teaspoon pure vanilla extract
With the mixer on low, slowly add in half of the flour mixture. Mix until just combined then add in all of the espresso mixture. Once incorporated, add in the remaining flour mixture and mix until combined.
Add in the chocolate chips and mix once more.
½ cup chocolate chips
Pour the batter into the prepared pan. Bake for 55-65 minutes, or until a toothpick inserted into the center of the cake comes out clean.
Let the cake cool in the pan for 15 minutes, use the parchment sling to transfer to a wire rack and cool completely.