Step 1

Spray a half sheet jelly roll pan (13x18") with non stick cooking spray. Preheat oven to 350 degrees.

Step 2

Cream peanut butter, butter, and sugars in a large mixing bowl. Beat in the eggs and vanilla. Stir in flour, baking soda, salt, and oats.

Step 3

Mix together well and press dough evenly into the prepared pan.

Step 4

Bake at 350 for 15 minutes, or until just barely set in the middle. Don't over bake.

Step 5

While bars are still warm, drop spoonfuls of peanut butter on top, and spread evenly.

Step 6

Cool completely then spread chocolate frosting over the peanut butter.

Step 7

For frosting, beat butter and cocoa in a mixing bowl until smooth. Add powdered sugar, salt, and vanilla. Add enough milk to make a spreadable consistency and beat till smooth and creamy.