Preheat the oven to 350°F (175°C) and line a 9x5-inch loaf pan with parchment paper with overhang.
In a large bowl, whisk together the flour, cocoa powder, baking soda, baking powder, and salt.
In another bowl, whisk melted butter, granulated sugar, and brown sugar until smooth.
Add eggs one at a time to the wet mixture, mixing well after each addition.
Stir in the buttermilk and vanilla extract.
Slowly pour in hot coffee or hot water and mix until fully combined.
Gradually fold the dry ingredients into the wet ingredients, stirring just until combined to avoid overmixing.
Fold in the chocolate chips gently.
Pour the batter into the prepared loaf pan and sprinkle extra chocolate chips generously on top.
Bake for 50 to 60 minutes, until a toothpick inserted into the center comes out with a few moist crumbs.
Let the loaf cool in the pan for 10 to 15 minutes before transferring to a wire rack to cool completely.