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

In a large mixing bowl, combine slightly melted peanut butter, sugar, and mashed bananas. Add vegetable oil and eggs, mixing until smooth.

Stir in cocoa powder, baking soda, salt, and vanilla extract until dry ingredients are incorporated.

Gradually add all-purpose flour, stirring until just combined to avoid a dense bread.

Pour the batter into the lined loaf pan and smooth the top. Optionally top with banana slices.

Bake for approximately 55 minutes, or until a knife inserted in the center comes out clean.

Allow the bread to cool in the pan for about 20 minutes on a wire rack.

Melt additional peanut butter and drizzle over the cooled bread for extra flavor.