Step 1

Preheat oven to 350 degrees.  Cream together the brown sugar, white sugar, butter, and peanut butter.

Step 2

Add the eggs, salt, baking soda, rolled oats, and flour.  Blend until until it is all mixed together.

Step 3

Spread on a large 15x9 inch pan.  Bake for 15 minutes, no longer, and let cool completely.

Step 4

After cooled spread a thin layer of peanut butter on top of the cookie.  I use about 1/2 cup and soften it in the microwave so it is easier to spread.

Step 5

For the frosting, melt butter and add the cocoa.  Remove from heat and add the powdered sugar, vanilla, and milk.  Mix together very well and spread the final frosting layer on the very top.  Also I have found that if you let the bars chill with the frosting in the fridge for an hour, the frosting will set up faster so that you can consume them quicker. :)