To brown butter, place in saucepan over medium heat and bring to a boil.
Boil, stirring constantly until lightly browned.
This may take five or ten minutes.
Place browned butter in a mixing bowl.
Add brown sugar and mix thoroughly.
If the mixture has not cooled sufficiently, wait a few minutes before adding egg, vanilla and salt.
(So the egg doesn’t scramble!).
Mix again until thoroughly mixed.
Stir in flour and bananas and mix until combined.
Pour mixture into a greased 9x13” glass baking dish.
Bake at 350° for about 40 minutes until a toothpick inserted in center comes out clean.
Allow blondies to cool completely before icing with browned sugar icing.