Step 1

Preheat the oven to 160c (fan oven) and grease and line a loaf tin with baking paper.

Step 2

In a large bowl, mash the bananas with a fork or a potato masher. Then add the eggs, sugar and oil. Using a whisk, combine well.

Step 3

Then add the flour and baking powder and whisk together until thoroughly mixed.

Step 4

Put the Nutella in a bowl and microwave for 10-15 seconds on a high heat until it loosens and is more liquid-like.

Step 5

Take 1/3 of the banana bread batter and mix well with the Nutella.

Step 6

Pour the banana bread batter into the tin. Then put spoonfuls of the Nutella mixture into the mixture and using a skewer and swirl and mix the two batters. If you want more of a marble effect, then put spoonfuls of each batter in alternately before swirling. Bake for 45 minutes, or until the cake has well risen and a skewer inserted into the centre comes out clean.

Step 7

Cool in the tin for 10-15 minutes, then turn out onto a wire rack to cool completely. Slice and serve.