Preheat the oven to 325°F. Line a 9×5-inch metal loaf pan with parchment paper and spray with nonstick cooking spray.
To a medium, microwave-safe bowl, add the milk chocolate chips. Microwave in 30-second intervals, stirring in between, until the chips are melted and smooth. Set aside to cool slightly while you prepare the dry ingredients.
In a medium bowl, whisk together the flour, cocoa powder, baking soda, and salt.
To the bowl of a stand mixer with a paddle attachment, add the eggs and sugar. Beat until light and fluffy, about 5 minutes.
With the mixer on low, add the melted chocolate, vegetable oil, and coffee. Mix until smooth.
Gradually add the dry ingredients to the wet ingredients, mixing until no lumps remain.
Fold in the ¾ cup of the mini chocolate chips and ¾ cup blueberries.
Pour the batter into the prepared loaf pan. Top with the remaining ¼ cup of mini semi-sweet chocolate chips and ¼ cup of blueberries.
Bake for 75-85 minutes, or until a toothpick inserted into the center of the bread comes out with a few crumbs, but no wet batter.
Allow the cake to cool completely in the pan before adding the chocolate ganache.