Chocolate Dream Whoopie Pies

Directions

1. In a large bowl, combine the cake mix, eggs, oil and vanilla; beat on low speed for 30 seconds. Beat on medium for 2 minutes (mixture will be sticky).
2. Drop by 2 tablespoonfuls 2 in. apart onto greased baking sheets. Bake at 350° for 9-11 minutes or until edges are set. Cool for 2 minutes before removing to wire racks to cool completely.
3. For filling, in a small saucepan, combine the sugar, flour and salt. Gradually add milk. Bring to a boil; cook and stir for 1-2 minutes or until thickened. Stir in chocolate chips until melted. Transfer to a small bowl; cover and refrigerate until chilled, about 1 hour.
4. In a large bowl, beat the shortening and butter until fluffy. Beat in chocolate mixture and vanilla.
5. Spread chocolate filling on the bottoms of half of the cookies, about 2 tablespoons on each; top with remaining cookies. Roll sides in miniature chocolate chips for garnish. Store in the refrigerator.