preheat oven to 180 c

spray a 12 muffin tin with oil

In a bowl, whisk together flour baking powder and baking soda. Set aside

In another bowl, whisk together bananas, brown sugar, peanut butter, oil, egg and vanilla until well combined. Pour in dry ingredients and stir together until just incorporated and no dry streaks remain

Scooped a heaping tablespoon of batter into each muffin cup. Dollop a teaspoon of Nutella in the centre over the batter. Then cover of the Nutella with an additional tablespoon of batter

Bake for 18 to 20 minutes or until golden brown the edges. Let cool in pan for 5 minutes then transfer to a wire rack to cool completely