Rich Ding Dong Sheet Cake with Creamy Filling Step-by-step instructions

Before you start

Before beginning the assembly, ensure the chocolate cake is fully baked and cooled completely to room temperature.

Prepare the fluffy white cream filling and the glossy fudge topping according to the recipe instructions or ensure they are ready for use.

Have a clean, flat workspace ready for slicing and assembly, and clear enough room in the refrigerator to hold the 9x13 inch pan level. Having a serrated knife and an offset spatula within reach will streamline the process significantly.

Instructions

Slicing the cake

1. 1Prepare the cake layers
   Using a long serrated knife, carefully slice the pre-baked chocolate sheet cake horizontally into two even layers. If the cake has a domed top, trim it flat before slicing to ensure the layers stack evenly.
   Look for The cake layers look level and uniform in thickness.
   Tip Chill the baked cake for at least one hour before slicing to prevent crumbling.

The cake layers are sliced into two uniform pieces. The edges are clean and the crumb is firm, indicating the cake was sufficiently cooled before the slicing process began, ensuring a sturdy base for the layers.

Applying the cream

2. 2Assemble with cream
   Place the bottom layer of the chocolate cake back into the baking pan. Spread the fluffy white cream filling evenly over the surface using an offset spatula, extending it all the way to the edges. Ensure the custard-based filling is cooked to 160°F (71°C) if preparing from scratch.
   Look for The cream is spread in a smooth, even layer across the cake base.
   Safe temperature 160°F (71°C) internal temperature (egg dishes)
   Tip Avoid overworking the cream to maintain its light and airy texture.

The cream filling is spread evenly across the bottom layer. It reaches the very edges of the cake without spilling over, creating a perfectly flat and stable surface for the top layer to rest upon.

Glazing and setting

3. 3Top with fudge and chill
   Place the second cake layer on top of the cream filling. Spread the glossy fudge topping over the top cake layer. Refrigerate the assembled cake for at least one hour to allow the layers to set before slicing into squares.
   Look for The fudge topping appears shiny and the cake feels firm to the touch.
   Tip Wipe the knife blade with a hot, damp cloth between cuts for clean square edges.

The fudge topping covers the cake with a smooth, mirror-like finish. The cake is now ready to be refrigerated, which will firm up the cream and set the fudge, allowing for perfectly clean slices.

Common mistakes

A common mistake is attempting to slice the cake while it is still warm, which leads to crumbling and a messy appearance. Another error is applying the cream filling while the cake is warm, causing the filling to thin out and lose its fluffy texture.

Ensure the cake is completely cold before starting. Additionally, failing to chill the cake after adding the fudge topping can result in a smeared appearance when attempting to cut the final portions for serving.

How to tell it’s done

The cake is considered done when the layers are securely stacked and the fudge topping has set sufficiently in the refrigerator. The cream filling should be firm enough that it does not squeeze out when the cake is sliced.

Because this recipe uses prepared components, there is no internal temperature to monitor for safety, but ensuring the cake is properly chilled is the key to achieving the desired structure and presentation.

• Egg dishes: 160°F (71°C) in the thickest part