Browned Butter Frosting

This is the frosting recipe I used on the Spicy Orange Pumpkin Bars. It was included with this recipe, but it is similar to many other browned butter frostings. Browning butter gives it a deeper, richer, more aromatic flavor, that is a nice alternative to regular frostings. Browned butter frosting is also good on pretty much any type of cake or cookies, but is especially good with blueberries, apple, pumpkin, carrot, and spice. It can be used in other recipes too, such as muffins, and savory dishes.
You can add some cinnamon, ginger, or cloves to this frosting, or use orange juice instead of milk to enhance the flavor of the bars even further. You could also use a cream cheese frosting on these bars instead, which would also be good.

Browned Butter Frosting
1/3 cup unsalted butter
2 cups icing sugar
1/2 teaspoon vanilla extract
2-4 Tablespoons milk

In a small saucepan over medium heat, melt the butter. Cook, stirring often, for about two minutes longer, or until butter is golden brown and begins to smell nutty, be careful not to burn the butter. Pour into a bowl and add remaining ingredients. Beat, adding more milk if necessary, to achieve a  spreading consistency. Immediately spread over Spicy Orange Pumpkin Bars. 
I found the consistency was too greasy, because the proportion of butter to icing sugar was too high, and I also did not think there was quite enough icing to frost the entire pan. So I added another 1/2 cup of icing sugar. I ended up using 3 Tablespoons of milk. This is a rich, buttery frosting, that is quite sweet.