Set the oven at 180 Degrees Celsius. Line a 8x8 inch baking tray with baking paper.
To a large mixing bowl add sweet potato purée, syrup, peanut butter, vanilla extract, egg and oil. Stir until the mixture is well combined.
Follow by adding the cacao powder, baking powder and salt, mix it in then follow with the flour. Mix until you get a batter texture.
Pour the chocolate chips into the mixture and gently fold it in. Transfer the batter to your baking tray.
Bake for 30 min. Once baked, remove it from the oven and leave it in the baking tray for at least 40 min to set before removing it from the tray.
Serve with a drizzle of peanut butter or vanilla ice cream.