- Adjust oven rack to lower-middle position and preheat oven to 325 F or 160 C.
- Grease and flour 8 1/2 inch x 4 1/2 inch loaf pan.
- In a small bowl, stir together :
 1 Cup All-Purpose Flour;
 1 Teaspoon Salt;
 
- In a medium bowl, place :
 3/4 Cup Dutch-Processed Cocoa Powder;
 2 Ounces Milk Chocolate, Chopped Fine;
 
- Pour :
 1/3 Cup Boiling Water; over the cocoa and chocolate and stir until the chocolate is melted and there
                are dry streaks of cocoa powder.
- Let cool for 5 minutes.
- Using an electric mixer, beat :
 1 Cup Unsalted Butter, Room Temperature;
 1 Cup Granulated Sugar;
 1/4 Cup Light Brown Sugar;
 2 Teaspoons Vanilla Extract;
 Chocolate Mixture;
 on medium-high speed until fluffy, 2 to 3 minutes.
- Add :
 5 Large Eggs, Room Temperature; one at a time and beat until combined.
- Reduce the speed to low and add :
 Flour Mixture; in 3 additions, scraping the sides of the bowl as needed.
- Give the batter a final stir by hand using a rubber spatula (the batter may
                look a little curdled).
- Pour the batter into the prepared pan and gently tap the pan on the counter to
                release air bubbles.
- Bake until a toothpick inserted into the center comes out clean, 1 hour to 1
                hour 10 minutes, rotating the pan halfway through baking.
- Cool in the pan for 10 minutes, then turn out onto a wire rack to cool
                completely before serving, about 2 hours.