BANANA BREAD BROWNIES

4.I spread the batter evenly into the prepared pan and bake it for 20 to 25 minutes, or until it turns golden brown.
5. Meanwhile, for the frosting, I heat 1/2 cup of butter in a large saucepan over medium heat until it starts boiling. I let the butter turn a delicate brown and then remove it from the heat immediately.
6. I add the powdered sugar, vanilla extract, and milk to the browned butter. I whisk it all together until smooth; the consistency should be thicker than a glaze but thinner than frosting.
7. Using a spatula, I spread the brown butter frosting over the warm bars. It’s easier to spread the frosting while the bars are still warm.