Spread on half the cookies and top each with another cookie. Yields 5 dozen
In a mixing bowl cream butter, peanut butter and sugars. Add vanilla. Add eggs one at a time, beating well after each addition. Mix flour, baking soda and salt in a separate bowl. Add to mixture in mixing bowl.
Shape into 1" balls and place 2" apart on ungreased baking sheets. Flatten with tines of the fork. Bake at 375 degrees for 5 to 6 minutes (don't over bake). Cool on wire racks. In a mixing bowl, combine and mix the filling ingredients until smooth.