Ingredients For This Six Layer Chocolate Cake With Marshmallow Filling
Chocolate Cake Ingredients
2½ cups + 1 tablespoon all-purpose flour
3 cups granulated sugar
1 cup + 1 tablespoon Dutch-process cocoa powder
1 tablespoon baking soda
1½ teaspoons baking powder
1½ teaspoons salt
3 eggs, at room temperature
1½ cups buttermilk, at room temperature
1½ cups strong black coffee, hot
¾ cup vegetable oil
4½ teaspoons vanilla extract
3/4 cup granulated sugar
1/2 cup light corn syrup
1/4 cup water
1/8 teaspoon fine salt
2 large egg whites, at room temperature
1/4 teaspoon cream of tartar
1 1/2 teaspoons pure vanilla extract
Malted Chocolate Frosting Ingredients
2 cups unsalted butter, at room temperature
4 cups powdered sugar
¾ cup Ovaltine Classic
1 tablespoon vanilla extract
Pinch of salt
8 ounces semisweet or dark chocolate chocolate, melted and cooled
½ cup heavy cream
Make the Cake:
Preheat oven to 350 degrees F. Grease three 8-inch round cake pans, line the bottoms with rounds of parchment paper, grease the parchment, then flour the insides of the pans, tapping out excess; set aside.
In the bowl of an electric mixer (or large mixing bowl if you’re using a hand mixer), sift together the flour, sugar, cocoa powder, baking soda, baking powder and salt. In a medium bowl, whisk together the eggs, buttermilk, coffee, oil and vanilla.
Add the wet ingredients to the dry ingredients and mix for 2 minutes on medium speed. Scrape the sides and bottom of the bowl and mix for an additional 20 seconds (the batter will be very thin).
Divide the batter evenly among prepared pans. Bake for 20 minutes and rotate the pans in the oven. Continue to bake until a toothpick inserted into the center of one of the cakes comes out almost clean (with a few moist crumbs), about 12 more minutes. Cool the cakes (in the pans) on wire racks for 20 minutes, then carefully turn them out onto cooling racks to cool completely.
Make the Marshmallow Crème :
Stir together the sugar, corn syrup, water, and salt in a small saucepan over high heat. Bring to a boil, stirring occasionally, until the mixture reaches 240°F on a candy/fat thermometer.
Place the egg whites and cream of tartar in the bowl of a stand mixer fitted with a whisk attachment. Start whipping the egg whites to soft peaks on medium speed. (The goal is to have the egg whites whipped and ready, waiting for your syrup to be drizzled in. If they’re whipping faster than your syrup is coming to temperature, just stop the mixer until the syrup is ready.)
When the syrup reaches 240°F, reduce the mixer speed to low and slowly drizzle about 2 tablespoons of syrup into the egg whites to warm them. (If you add too much syrup at once, the whites will scramble.) Slowly drizzle in the rest of the syrup. Increase the speed to medium high and whip until the marshmallow crème is stiff and glossy, about 7 minutes. Add in the vanilla and whip 2 minutes more. Use immediately or refrigerate stored in an airtight container for up to 2 weeks.
Make the Malted Chocolate Frosting:
Beat the butter and powdered sugar on low speed until blended together, about 1 minute. Add the Ovaltine, vanilla and salt, and continue to beat on low until well combined, about 1 to 2 minutes. Add the melted chocolate and beat on medium speed until smooth, about 2 minutes. Add the heavy cream and beat on medium-high speed for another minute.
Assemble the Cake:
Slice each cake layer in half horizontally so you have six cake layers. Place your first layer face-up on a cake plate and cover with one-third of the Toasted Marshmallow Frosting. Place another cake layer face-up and cover with about ¾ to 1 cup of Malted Chocolate Frosting. Repeat, alternating marshmallow and chocolate filling layers, until you come to your cake final layer, which you will place face-down. Frost the entire outside of cake with the remaining Malted Chocolate Frosting.
Cake is best served the same day it is made, but leftovers can be stored at room temperature or in the refrigerator, well-wrapped, for up to 3 days.