Oatmeal Cake with Browned Butter Frosting

This cake is good; it's frosting is out of this world delicious!  It is quick and easy to make and uses common pantry ingredients.

Oatmeal Cake
1 1/2 cups boiling water
1 cup uncooked oatmeal (either the quick oats or the regular oats work)
1/2 cup butter
1 1/2 cups flour
1 teaspoon soda
1 1/2 teaspoons cinnamon
1/2 teaspoon salt
1 scant cup sugar
1 cup packed brown sugar
1 beaten eggs

Put the oatmeal and the butter, cut up, in a large bowl.  Pour the boiling water over them.  Stir until the butter is melted.  Add the flour, soda, cinnamon, and salt.  Stir until well blended.  Add sugars and eggs and beat well.  Pour into a well-greased 13x9 pan.  Bake at 375 for 25 minutes or until a wooden pick comes out clean.  Make little holes in the cooling cake by piercing with a fork.  While still a little warm, frost with the browned butter frosting.

Browned Butter Frosting
1/2 cup (115 grams) butter
3 cups powdered sugar (about)
Milk, as needed

Put the butter in a saucepan.  Cook over medium heat until the butter starts to turn brown.  Little flecks of brown will come up from the bottom and it will smell nutty and yummy.  Remove from heat before it burns!  Beat in the powdered sugar and enough milk to make a nice spreading consistency. 

Spread over the warm cake.