I found this recipe on another blog I follow, "http://cookiesandcups.com" and I followed the instructions fairly closely, including the boxed cake mix. I was concerned that a 'scratch cake' might be a little too delicate and would break in the assembly of this cake, and since it was for my daughter's birthday, I didn't want to risk it. The only thing I did change was to make my own Marshmallow Fluff, as opposed to buying a jar of the stuff.
We enjoyed this on her birthday and I froze the rest for the weekend. It froze beautifully! So treat yourself and your family a little, and freeze the rest for another day or a special lunchbox treat. Your Kids will love it!
To make Whoopie Pie Cake, you will need:
- 1 box Devil Food Cake mix,+ ingredients required on box
- 1 extra egg
- 1 cup butter, softened
- 2 cups marshmallows
- 2 tsp simple syrup ( 2 tsp sugar + 2 tsp hot water - stir until sugar is dissolved)
- 3 cups powdered sugar
- 1/2 cup whipping cream
- 1/3 cup cocoa
- 2 Tbsp sugar
- 1/4 tsp strong brewed coffee (I used decaf)
- 1/4 tsp vanilla
For Cake: Preheat oven to 350 degrees F.
Line 2 9x13 pans with parchment paper, or grease and dust with cocoa powder.
Prepare oven according to package directions, adding extra egg. Divide batter between the pans and bake for 15 to 20 minutes, until toothpick comes out clean. Allow to cool completely.
For Filling: In a double boiler, place marshmallows, stir to melt. Add the simple syrup. This will be very sticky and maybe a little hard to work with. I added about 2 tsp of the butter while mixing, to make it a little more manageable.
For Ganache: Simmer whipping cream over medium heat, stirring constantly until just before boiling (do not allow cream to hit boiling!). Add in sifted cocoa and remaining ingredients until well incorporated. Allow to cool a bit to thicken (it will stay fairly runny).
Once the cake is cooled, lift out of pan with overhanging parchment paper and place on serving tray.
Refrigerate until ready to serve, and refrigerate or freeze leftovers.