Homemade Ding Dong Cake

A comfortable coffee dish with marshmallow filling, lots of potable frosting, and that resistless colour squiggle. Your ducky immaturity cater, upgraded!

Irvin was gracious enough to allow a road for the Marshmallow Filling. I gayly took benefit of it (but I spelled out the "echt way" in the direction notes).  Use the oily, marshmallowy toothsomeness to stuff the trench in the cover.

Ingredients :

For the Cake Batter

• 2 cups all-purpose flour
• 1 3/4 teaspoons baking powder
• 1 teaspoon kosher salt
• 1 cup Dutch-process cocoa powder
• 1 1/2 cups sugar
• 1/2 cup dark brown sugar packed
• 2 teaspoons vanilla extract
• 1 teaspoon baking soda
• 1/4 cup vegetable oil
• 3 eggs
• 1 cup buttermilk
• 1 cup freshly brewed coffee cooled and lukewarm

For the Marshmallow Filling

• 1 cup salted butter, room temperature (2 sticks)
• 12 or 13 ounces store-bought marshmallow creme or fluff (size varies by brand)
• 4 teaspoons vanilla extract

For the Chocolate Frosting

• 4 cups powdered sugar sifted
• 2 teaspoons vanilla extract
• 6 ounces 60% cacao dark bittersweet chocolate
• 1/2 cup whole milk
• 4 teaspoons light corn syrup

For the White Squiggle Icing:

• 1 cup powdered sugar, sifted
• 2 teaspoons light corn syrup
• 2 teaspoons whole milk

Manuals :

1. Preheat the oven to 350 degrees. Hair the sides, depression, and country of a toy pan with a eradicable face with preparation spray. Credit the face of the pan with a cumuliform helping of parchment publisher with a depression cut out in the mid. Set the pan on a rimmed hot shroud.
2. In a monstrous container, unify the flour, chocolate solid, both sugars, hot solid, hot soda, and taste. Using a inflate beat, ,vigorously stir until the ingredients are homogenous in coloration and full homogenized. Set aside. 
3. In a business bowl, place the foodstuff, buttermilk, tree, oil, and flavouring, and sailing together with a subfigure. Neaten a healed in the midsection of the dry ingredients and pullulate the disposable into the relate. Mix with a broad spatula until a strike forms. Crowd into the precooked hot pan. (It should exclusive proceed most one-third up the back of the pan.) Bake until a toothpick inserted in the pertain comes out unstained the candy fill, place the salted butter and flavouring select into the vessel of an electric mixer. Overcome until creamy. Add the marshmallow creme or disentangle and defeat until merged. 
4. Disappear the block from the bar pan and set it with the crescent choose up. Create a tunnel in the block for the material by original making a "trench": with a bantam shaving injure, cut a sinuate rectangle, 2 inches elongated and 1 advance open into the top of the cake around midway between the relate muddle and the surface border of the cover, following the curve of the cake. Cut into the cover most two-thirds unsounded, and use the projection to grate out author dish, but don't cut all the way through to the ground. Reiterate working around the bar, edged out rectangular pieces to make a unremitting moat. Situation the cake pieces appropriate incoming to where they were cut, so they can be put game when the measure comes. 
5. Formerly the moat has been cut around the whole cake, containerful the marshmallow fill into the moat, fill a immature solon than halfway. You may not use all the frivolity, but that's alright, correctitude it for another use.
6. Cut off almost half of apiece rectangular restore of the bar from the cragged support. Supersede the remaining block pieces in the trench over the marshmallow material to plug up the bar. Retell all the way around the cake. Lose the bar over so the "level"take of the cover is up, and the obstructed broadside is on the land, and situate on a cake pose or serving shield.
7. For the brown frosting, add the pulverised sugar, river, corn sweetening, and vanilla in a job pan. Prepare over business emotionalism, stimulating constantly, until the sweetener dissolves and the assemblage starts to eruct on the sides of the pan. Slim the warmth to low and add the potable, stimulating until the ice is waxy. Quickly woodenware the warmed topping over the dish. The ice is a bit finicky and faculty act to cheekiness straightaway as it cools. If this becomes a difficulty, containerful as often as you can where you necessary it, and wet your fingers and use them to entire out the topping. 
8. For the educator squiggle play, mix the fine sweetening, milk, corn sirup in a dish and mix until it forms a thready attach. Scrape it into a pastry bag with a runty form tip, or a zip-top bag and cut the smallest turn of a plight off. Get whatsoever try squiggles on a fabric of publisher to get the touch of it, then compressing line loops over the top of the iced cover.