Preheat oven to 375 F.
Mix all ingredients together in medium sized mixing bowl until creamy. Spread mixture onto a greased cookie sheet.
Bake for 10-15 minutes or until golden brown.
Let cool, then spread a layer of peanut butter over cookie. Repeat with chocolate frosting. Slice into bars.
[My 2 Cents]
To prevent cookie from crumbling, make sure they are completely cooled before frosting. Usually bars taste better the 2nd day.
Adapted from My friend, Hannah