In a mixing bowl, sift together the flour, salt, baking powder and baking soda. Mix well
In another bowl, take the mashed bananas and add in the eggs, oil, maple syrup and vanilla essence. Whisk this mixture very well until well combined and light in consistency. Gradually add the flour mixture and whisk again, until nothing looks dry
Line the muffin tray with cup cake wrappers, pour the banana cake batter (using a spoon or an ice cream scoop) until ¾ th full in each cup. Tap the tray a few times to remove any air bubbles
Add a tablespoon of Nutella over each of them and swirl them around, gently, using a toothpick. Now, bake in a preheated oven at 180° C for 30 minutes or until a skewer inserted in the centre of the muffins comes out clean
Remove from oven and let the muffins sit for 10 minutes. Enjoy your yummy and healthy Nutella swirl banana muffins, with tea, coffee and/or milk
