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Preheat oven to 350 degrees. In a large mixing bowl, cream butter, brown sugar, sugar, eggs, vanilla and 3/4 cup of peanut butter until light and fluffy -- about 4 minutes. Reserve remaining 3/4 cup of peanut butter.
Stir in oats, flour, baking soda, and salt. Spread into a 9 x 13 pan. Bake for 12-15 minutes. Cool for 10 minutes.
In a mixing bowl, whip remaining 3/4 cup of peanut butter until light and fluffy and spread all over cookie layer.
Melt butter in medium saucepan over medium-low heat. Add the cocoa and milk and whisk together, stirring constantly. Heat just until boiling. Remove from heat and gradually add powdered sugar, whisking well after each addition. Gently spread the chocolate frosting over the peanut butter layer. Cool completely and cut into bars. May refrigerate.
Nutrition information is automatically calculated, so should only be used as an approximation.
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