In a mixing bowl, whisk together ½ cup of the peanut butter, egg, maple syrup, salt, baking soda and cocoa powder. Pour into a 20x20 cm – 8x8"pan.

Melt the remaining peanut butter in a bowl in the microwave for about 15 seconds, drizzle over the brownie batter and swirl with a knife.

Bake in a pre-heated oven at 175°C – 350°F for 20-30 minutes or until a toothpick comes out clean.

Let it cool down, cut and serve.