Preheat your oven to 350°F (175°C). Grease a 9x5-inch loaf pan and set aside.
In a large mixing bowl, whisk together the flour, sugar, cocoa powder, baking powder, and salt until well combined.
In another bowl, mix the melted butter, eggs, and vanilla extract until smooth.
Pour the wet ingredients into the dry ingredients and stir until just combined. Do not overmix.
Fold in the hot fudge sauce and chocolate chips until evenly distributed.
Pour the batter into the prepared loaf pan and smooth the top.
Bake for 30-35 minutes, or until a toothpick inserted into the center comes out with a few moist crumbs.
Allow the bread to cool in the pan for 10 minutes before transferring it to a wire rack to cool completely.