Preheat your oven to 350°F (175°C). Grease and flour your loaf pan or line it with parchment paper.

In a medium bowl, whisk together the flour, cocoa powder, baking powder, and salt until well combined.

In a separate large bowl, whisk the eggs and granulated sugar together until smooth. Stir in the melted butter and vanilla extract until fully combined.

Stir in the hot fudge sauce into the wet mixture until smooth.

Gradually fold the dry ingredients into the wet ingredients, mixing just until combined.

Pour the batter into the prepared loaf pan and spread it evenly.

Bake in the preheated oven for 35–45 minutes, or until a toothpick inserted into the center comes out clean or with a few moist crumbs.

Allow the bread to cool in the pan for about 10 minutes before transferring it to a wire rack to cool completely.

Drizzle with extra hot fudge sauce before serving.