01 -
Set your oven to 175°C. Line 18 muffin cups with paper liners and keep them ready.
02 -
Whisk flour, baking powder, baking soda, and salt in a small bowl. Put this aside.
03 -
In a mixer bowl, toss mashed bananas, melted butter, both sugars, eggs, and vanilla. Beat on medium for 3 minutes till smooth.
04 -
Add dry mix to wet stuff. Stir slowly just until the batter looks combined without flour streaks. Don’t overdo it.
05 -
Heat Nutella in a microwave-safe bowl for about 30 seconds till it loosens up for easy swirling.
06 -
Drop batter into muffin cups filling about 3/4 full. Add a teaspoon of the warm Nutella on top and swirl lightly with a toothpick or knife.
07 -
Put them in the oven for 15 to 18 minutes. They're done when a toothpick stuck in the center comes out clean.
08 -
Let muffins cool in the pan for 15 minutes. Then move them to a rack to cool as much as you want or eat them warm.