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Preheat oven to 350 F. Line muffin tin with liners and set aside.
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Whisk flour, baking soda, baking powder and salt in a medium mixing bowl until combined. Set aside.
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In a stand mixer, combine banana, sugar, and brown sugar until incorporated. Beat in the egg, oil and vanilla and mix until combined. Slowly add in flour mix, stirring just until incorporated.
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Divide batter equally among 12 liners {about 3/4 full}. Drizzle each muffin with about 1 teaspoon of Nutella and use a toothpick to swirl it into the batter.
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Bake muffins until a toothpick inserted into the center comes out clean {beware of the ooey, gooey Nutella that might trip you up here}, or about 18 minutes.