Preheat oven to 350°F and line muffin tin with liners.
Whisk together flour, baking soda, baking powder and salt in a medium bowl. Set aside.
Combine banana, sugar, egg, oil and vanilla into a large bowl. Slowly add flour mixture and mix till there are no lumps.
Fill muffin liners 3/4 full and add a tablespoon of nutella on to each muffin and swirl into batter with a toothpick or knife in your preferred pattern.
Bake for 15-20 minutes until a toothpick comes out clean when inserted into the center.
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