Preheat the oven to 220°C. We use the setting with the fan. This ensures even distribution of heat.
In the bowl of your stand mixer fitted with the paddle attachment, beat together butter + sugar until well combined on medium-low speed.
Add room-temperature eggs one at a time. Scrape the sides of your bowl and beat a little more to make sure everything is well combined.
Add in baking powder + salt + vanilla, beat to combine.
With the mixer on low speed add the flour and milk alternating half each at a time, work quickly here we do not want to over mix. Turn off the mixer.
Fold in your mashed bananas using a spatula until well combined.
Grease a muffin tin with nonstick spray or vegetable oil. Using an ice cream scoop or large spoon fill the cavities of the muffin tin to the top.
Melt your Nutella in the microwave for a couple of seconds so it's easier to swirl into the batter.
Drizzle about 1 tbsp of Nutella onto each muffin. Use a wooden stick to gently swirl the Nutella into the muffin batter.
Place muffins in preheated oven for 5 minutes. Then turn down the heat to 175°C bake for another 18 -20 minutes or until a wood stick inserted into the center of the muffin comes out clean.
Let the muffins cool in the muffin tin for 5 minutes. Then remove them from the tin and let them continue to cool on a wire rack. Serve with some extra Nutella spread. Enjoy !
