Prepare the loaf pan: Grease a 9×5-inch loaf pan and line it with parchment paper.
Mix the dry ingredients: In a medium bowl, whisk together the flour, cocoa powder, salt, and baking powder.
Combine the wet ingredients: In a separate bowl, whisk the eggs and sugar until well blended. Stir in melted butter, milk, and vanilla extract.
Bring it all together: Gradually add the dry ingredients into the wet mixture. Stir until just combined.
Swirl in the hot fudge: Add half the batter to the loaf pan, then drizzle in half the hot fudge. Use a knife to gently swirl it through the batter. Repeat with the remaining batter and hot fudge.
Add chocolate chips (optional): For extra richness, sprinkle chocolate chips over the top before baking.
Bake: Bake your brownie bread at 350°F (175°C) for 50 to 55 minutes. A toothpick should come out with moist crumbs.
Cool and serve: Let the bread cool in the pan for 10 minutes before transferring to a wire rack. Drizzle with extra hot fudge if desired.
