Hershey's Devil's Food Filled Cookies

1/2 cup shortening
1 cup granulated sugar
1 egg
1 teaspoon vanilla extract
1 3/4 cups unsifted all purpose flour
1/2 cup Hershey's cocoa
1 1/4 teaspoons baking soda
1/8 teaspoon salt
1 cup buttermilk or sour milk *

Marshmallow Creme Filling:
1/4 cup butter or margarine, softened
1/4 cup shortening
1 cup Marshmallow Creme
1 1/2 teaspoons vanilla extract
1 1/4 cups confectioners' sugar

Cream shortening and sugar in large mixer bowl until light and fluffy. Add egg and vanilla extract; beat well. In a separate bowl combine flour, cocoa, baking soda and salt; add alternately with buttermilk or sour milk to creamed mixture. Beat well. Drop by tablespoonsful onto a lightly greased cookie sheet.

Bake at 375 degrees F for 8 to 10 minutes or until cookie springs back when touched lightly in center. Remove from cookie sheet; cool on wire rack.

Press cookies together in pairs using 1 to 1 1/2 tablespoons Marshmallow Creme filling.

* To sour milk: use 1 tablespoon vinegar plus milk to equal 1 cup.

Combine butter or margarine and shortening in small mixer bowl; blend well. Gradually add Marshmallow Creme, blending well. Blend in vanilla extract and confectioners' sugar until smooth.