As a child I ate pre-packaged cakes called "Devil Dainties"...I think they were from "Jack's Bakery".  They were very affordable for a nickel and very filling for a little 7 year old girl in the 50's.

I never realized that I was eating what is called "whoopie pies".

I found this recipe for Whoopie Pies and thought you might enjoy making them.  Bon Appetit!

Whoopie Pies

Makes8 individual desserts

• Active time:30 min
• Start to finish:1 hr

The generally accepted legend of whoopie pies is that they evolved from little individual cakes mothers would make their children from leftover chocolate cake batter and frosting—the "whoopie" is said to be the kids' happy shout.

For cakes

• 2 cups all-purpose flour
• 1/2 cup Dutch-process cocoa powder
• 1 1/4 teaspoon baking soda
• 1 teaspoon salt
• 1 cup well-shaken buttermilk
• 1 teaspoon vanilla
• 1 stick (1/2 cup) unsalted butter, softened
• 1 cup packed brown sugar
• 1 large egg

For filling

• 1 stick (1/2 cup) unsalted butter, softened
• 1 1/4 cups confectioners sugar
• 1 cup marshmallow cream such as Marshmallow Fluff
• 1 teaspoon vanilla

Make cakes:

• Preheat oven to 350ºF.
• Whisk together flour, cocoa, baking soda, and salt in a bowl until combined. Stir together buttermilk and vanilla in a small bowl.
• Beat together butter and brown sugar in a large bowl with an electric mixer at medium-high speed until pale and fluffy, about 3 minutes in a standing mixer or 5 minutes with a handheld, then add egg, beating until combined well. Reduce speed to low and alternately mix in flour mixture and buttermilk in batches, beginning and ending with flour, scraping down side of bowl occasionally, and mixing until smooth.
• Spoon 1/4-cup mounds of batter about 2 inches apart onto 2 buttered large baking sheets. Bake in upper and lower thirds of oven, switching position of sheets halfway through baking, until tops are puffed and cakes spring back when touched, 11 to 13 minutes. Transfer with a metal spatula to a rack to cool completely.

Make filling:

• Beat together butter, confectioners sugar, marshmallow, and vanilla in a bowl with electric mixer at medium speed until smooth, about 3 minutes.

Assemble pies:

• Spread a rounded tablespoon filling on flat sides of half of cakes and top with remaining cakes.

Cook's Notes:

• Cakes can be made 3 days ahead and kept, layered between sheets of wax paper, in an airtight container at room temperature.
• Filling can be made 4 hours ahead and kept, covered, at room temperature.