Recipe Card

Preheat the oven to 375F and line an 8x8 baking dish with parchment paper.
In a large bowl, beat together sugar, sour cream, butter, and eggs until creamy. Blend in mashed bananas and vanilla extract.
Add flour, baking soda, and salt. Stir until just combined and spread the batter evenly into the pan.
Bake for 20 to 25 minutes or until golden brown. Let cool slightly and remove from the pan using the parchment.
Brown the butter in a medium saucepan over medium-high heat until brown bits form. Pour into a heat-proof bowl.
Whisk in powdered sugar and vanilla until smooth.
Spread the icing on the bars once they have cooled for 10-15 minutes.