The Best Peanut Butter Fingers Ever!!

This is my mom's recipe and they are to die for! I love making these for big get togethers or a birthday treat!

Peanut Butter Fingers

1 cup granulated sugar

1 cup brown sugar

1 cup butter or margarine

2 eggs, beaten

1 tsp vanilla

2/3 cup peanut butter

1 tsp baking soda

½ teaspoon salt

2 cups flour

2 cups oatmeal

Chocolate Frosting:
6 Tbsp margarine
2 2/3 c powdered sugar 
1 tsp vanilla
½ cup cocoa
3 ½ Tbsp milk (slowly)

Cream together sugars and butter. Add eggs, vanilla, peanut butter and mix. Add soda, salt, flour, oatmeal and mix well. Pat into well greased – large cookie sheet. Bake at 350 degrees for 15 minutes (put extra pans under to protect from spillage). Remove pan from oven and cool a few minutes; spread with thin layer of peanut butter. Top with frosting: blend the 5 ingredients (under the chocolate frosting) together until smooth and fluffy, then spread it over cooked base. Chill to set. Cut in strips to serve.