Banana Nutella Blondies 7 Steps
Preheat oven to 350°F and line a 9 x 11 inch baking sheet with parchment paper.
Brown the butter in a medium-sized pot by melting until the butter foams and then eventually starts turning an amber colour, approximately 8-10 minutes on medium heat. Transfer immediately to a mixing bowl to cool (it should be completely cooled before proceeding to the next step).
While the butter is cooling, in a mixing bowl combine the all-purpose flour, baking powder, milk powder and kosher salt and whisk until even.
Once the brown butter has cooled, whisk it with the brown sugar until smooth. Then whisk in the eggs, egg yolks, vanilla extract and mashed bananas.
Carefully whisk in the dry ingredients with the wet ingredients and mix just until no lumps remain. Do not over mix. Transfer to the parchment lined baking sheet and spread into an even layer.
Carefully dollop small teaspoon amounts of the Nutella all over the surface of the blondie batter and then using a toothpick or skewer, swirl lightly. Bake in the preheated oven for 35-40 minutes until a toothpick inserted into the centre comes out clean.
Remove from the oven and allow to cool in the pan for 20-30 minutes before cutting into bars or squares as desired, top with Maldon salt.