Preheat your oven to 350°F (175°C). Grease a 9x5-inch loaf pan with butter or non-stick spray.

In a large mixing bowl, whisk together 1 cup all-purpose flour, 1 cup granulated sugar, ½ cup cocoa powder, and 1 teaspoon baking soda until well combined.

In another bowl, beat together 2 large eggs, ½ cup melted unsalted butter, ¾ cup hot fudge sauce, and 1 teaspoon vanilla extract until smooth.

Slowly pour the wet mixture into the dry ingredients, gently stirring with a spatula until just combined.

Carefully pour the batter into your prepared loaf pan, smoothing the top evenly.

Bake for 25-30 minutes, checking for doneness with a toothpick.

Let it cool in the pan for about 10 minutes, then transfer to a wire rack to cool completely.

Once cooled, slice and serve with hot fudge sauce or a scoop of ice cream.