1. Preheat the oven to 200°C (390°F). Line two baking sheets with baking parchment and set them aside.

2. Mix the flour, sugar, baking powder, and salt in a large bowl. Add the butter in small pieces and mix with the remaining ingredients using a fork or your fingers. Mash the bananas and add them to the bowl together with the egg – mix everything well. Next, add the rolled oats and fold them in. Finally, add the Nutella or an alternative gradually with a spoon and stir it in. Don’t mix too much – it’s okay if you can still see streaks in the mixture.

3. Using a cookie scoop* or tablespoons, place portions of dough on the first baking sheet, leaving some space in between – the cookies will spread quite a bit during baking. Bake the first batch of cookies for about 10-12 minutes, until they have set around the edges and started to brown a little. Remove the cookies from the oven and let them cool down briefly on the baking sheet, then transfer them to a wire rack to cool completely. Repeat the process with the second baking sheet and the remaining dough until all the cookies are baked.