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Preheat oven to 350. Spray a standard loaf pan with cooking spray and set aside.
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In a large bowl, whisk together flour, sugar, baking soda and salt.
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In a small bowl, whisk together eggs and vegetable oil. Add wet ingredients as well as mashed bananas to the dry ingredients. Stir with a rubber spatula or wooden spoon until combine.
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In another microwave-safe bowl, place Nutella. Microwave for 10 seconds to soften. Remove from microwave and add about 1/3 of the batter. Stir to combine.
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Place non-Nutella batter into load pan. Top with Nutella mixture. Use a butter knife to gently swirl Nutella mixture into regular batter.
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Bake for 55-65 minutes, or until a toothpick inserted into bread comes out clean.