Step 1

Preheat oven to 350 degrees F. In a large mixing bowl, cream together the butter, sugar and brown sugar.

Step 2

Add the eggs, vanilla, and peanut butter and mix well.

Step 3

In a separate bowl mix together the dry ingredients. Add dry ingredients to creamy mixture.

Step 4

Press firmly into a greased 9x13'' pan. Bake at 350 degrees for 17-21 minutes. Do not over-bake! They will look just barely set in the center, and they will harden as they cool. Allow to cool completely.

Step 5

Once cooled, spread a thin layer of peanut butter over the bars.

Step 6

Add butter to a small skillet over medium heat. Once melted, stir in cocoa.

Step 7

Remove from heat and add milk, powdered sugar and vanilla. Whisk until smooth, using electric beaters to get out any lumps, if needed. .

Step 8

Spread chocolate frosting over the top of the bars.