Start with 227g (16 tbsp) unsalted butter. Start with a few extra tablespoons of butter, since water evaporates as it browns. Also, keep in mind that European-style butter has less water content, so if you're using American-style butter you might want to start with even more butter.




Use very ripe bananas. The riper the better! Bananas become sweeter and more flavorful as they ripen, so wait until your bananas are spotty and falling off of their stems to make these blondies.




Measure the Nutella with your heart. There's no right or wrong amount of Nutella, so add as much or as little as you'd like!