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

In a large mixing bowl, whisk together melted peanut butter, sugar, ripe mashed bananas, vegetable oil, and eggs until smooth.

Add cocoa powder, baking soda, salt, and vanilla extract. Stir gently until just combined.

Fold in the all-purpose flour until there are no dry streaks left.

Pour the batter into the prepared loaf pan and smooth the top. Optionally, arrange banana slices on top.

Bake for approximately 55 minutes until a knife inserted comes out clean.

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

Microwave peanut butter for about 30 seconds to drizzle over the cooled bread.