Monkey Bars with Browned Butter Icing

A couple of weeks ago, I came across a recipe using aged bananas. I always have ripening bananas and am tired of making banana bread, so I thought, this recipe sounds pretty good, lets give it a shot. And to my coworkers approval, they turned out incredible.

Monkey Bars with Browned Butter Icing
Ingredients
For the bars:
2 cups all-purpose flour
1 teaspoon baking soda
3/4 teaspoon salt
1/2 cup butter, softened
1 cup granulated sugar
1/2 cup packed light brown sugar
2 large eggs
2 teaspoons vanilla extract
1 cup sour cream
1 & 3/4 cups mashed ripe bananas (3-4 bananas)
3/4 cups chopped pecans, toasted
For the icing:
1/2 cup unsalted butter
4 cups confectioners' sugar
3 tablespoons milk*
1 & 1/2 teaspoons vanilla extract

Instructions
To make the bars:
Preheat oven to 375°. Grease a 10"x 15" sheet pan and dust with flour.
Whisk together flour, baking soda, and salt. Set aside.
Beat butter, sugar, and brown sugar until light and fluffy. Add eggs and vanilla, mixing well. Mix in sour cream and bananas.
Gradually add flour mixture, mixing just until combined. Stir in pecans.
Pour batter into prepared pan and spread evenly.
Bake 20-25 minutes, or until golden brown. Place pan on wire rack to cool slightly while you prepare the icing.
To make the icing:
Place butter in a medium saucepan. Melt butter over medium heat. Continue cooking until butter foams and brown specks begin to form at the bottom of the pan.
Remove from heat. Add about 1 cup of confectioners' sugar, vanilla, and about 1 tablespoon of milk. Stir into butter. Add remaining sugar and milk in 2-3 more portions, working quickly to mix well.
Quickly spread icing evenly over warm bars. Allow bars and icing to cool before cutting into bars.
Notes
*The amount of milk you'll need may vary. Use as much as you need to make the icing spreadable. It shouldn't be as thick as frosting, but thicker than a glaze.