Sift together:

2 c. flour
1 tsp. baking soda
Dash of salt
1/3 c. cocoa

Cream together:

1/3 c. butter
1 c. sugar
1 egg
3/4 c. milk
1 tsp. vanilla

Add sifted dry ingredients to 3/4 cup milk and 1 teaspoon vanilla. Mix above with creamed butter, sugar and egg mixture. Beat in large bowl together until fluffy. Beat 5 more minutes. Drop by large tablespoonfuls onto cookie sheets. Bake at 350 degrees for 12 to 15 minutes.

FILLING:

1/2 lb. butter
2 c. confectioners' sugar
8 tbsp. marshmallow fluff
1 tsp. vanilla

Beat until fluffy and creamy (in large bowl) for about 5 minutes or longer. After cookies have cooled spread filling in middle and top with second cookie.