Preheat Oven: Preheat your oven to 350°F (175°C). Prepare a loaf pan with parchment paper and set aside.

Prepare Dry Ingredients: In a large mixing bowl, sift together the flour, cocoa powder, baking soda, baking powder, salt, and espresso powder. Set aside.

Prepare Wet Ingredients: In a separate medium mixing bowl, whisk the eggs until well beaten. Add the vegetable oil, sour cream, white granulated sugar, brown sugar, and vanilla extract. Mix until well combined and smooth.

Combine Wet and Dry Ingredients: Add the dry ingredients to the wet mixture and fold together until a thick batter forms. Be sure not to overmix; it's okay if there are a few lumps.

Pour Batter into Pan: Pour the batter into the prepared loaf pan, spreading it evenly with a spatula. Top with extra chocolate chips if desired

Bake: Place the loaf pan in the preheated oven and bake for 45-50 minutes, or until a toothpick inserted into the center of the bread comes out clean or with just a few moist crumbs.

Cool: Remove the bread from the oven and let it cool in the pan for about 20 minutes. Then, transfer the bread to a wire rack to cool completely before slicing.