Preheat your oven to 350°F (175°C) and line a large loaf pan with parchment paper.

In a large mixing bowl, combine slightly melted peanut butter, sugar, and mashed bananas, and whisk until well incorporated.

Add vegetable oil and eggs, mixing until creamy and smooth.

Stir in cocoa powder, baking soda, salt, and vanilla extract until fully integrated.

Fold in the all-purpose flour until just combined, then pour the batter into the prepared loaf pan.

Bake for approximately 55 minutes, or until a toothpick comes out clean.

Let it cool in the pan for about 20 minutes, then transfer to a wire rack.

Melt creamy peanut butter in the microwave and drizzle over the loaf once cooled.