Flour Salt Baking soda & powder Cinnamon Dark brown sugar Eggs Mashed bananas Milk Oil Melted butter Vanilla Nutella
In a large mixing bowl, stir together flour, dark brown sugar, cinnamon, salt, baking soda and baking powder until well combined.
In a separate large mixing bowl, whisk together eggs, mashed bananas, whole milk, vegetable oil, melted butter and vanilla extract until combined.
Pour the wet ingredients over the dry ingredients and fold just until combined. Do not overmix. Leaving some lumps is OK. The batter won't be perfectly smooth.
Spoon the batter into baking liners so that they're ¾ full. Dollop about ½ tablespoon Nutella on top of each muffin. Using a toothpick or skewer, swirl the Nutella around the batter.
Bake until a toothpick comes out clean on the muffin part, about 20 minutes. Remove from oven and place the baked muffins on a wire rack to cool.