Frosted Peanut Butter Bars (10x15 pan)

1 Cup Butter, softened

1 ½  Cups Packed Brown Sugar

1 Cup Sugar

2 ½  Cups Creamy Peanut Butter, divided

1 Egg

1 ½  tsp. Vanilla

2 ½  Cups Oats

2 Cups Flour

1 tsp. Baking Soda

½  tsp. Salt

CHOCOLATE FROSTING:

6 TBSP. Butter, softened

3 Cups Powdered Sugar

¼  Cup Cocoa

1 tsp. Vanilla

6-8 TBSP Milk

Mix butter and sugars.  Add 1 Cup peanut butter, egg, and vanilla; mix well.  Combine oats, flour, baking soda and salt: add to the creamed mixture.  Spread into a greased 10x15" pan.  Bake at 350 for 13-17 minutes.  Cool slightly on a wire rack, about 12 minutes.   Spread with remaining peanut butter.  Cool completely.

For frosting, combine butter, sugar, cocoa, vanilla, and enough milk to achieve spreading consistency.  Spoon over peanut butter bars and then spread evenly.