1 cup (2 sticks) of butter, softened
2 cups all purpose flour
1 cup honey graham cracker crumbs food processed into a fine crumb (85 grams or around 7 of the 4 piece sheets)
1 cup speculoos or biscoff cookies processed into a fine crumb (85 grams)
1 teaspoon cinnamon
1/4 teaspoon cardamon
2 teaspoons baking powder
3/4 teaspoon baking soda
3/4 teaspoon table salt
2/3 cup granulated sugar
1 cup dark brown sugar
4 large eggs at room temperature
2 cups buttermilk, well shaken (or 1 1/3 cups milk and 2/3 cup sour cream)
1/2 pound dark chocolate chopped small (I love the trader joes 72 percent pound plus)
3/4 cup heavy cream
2 pinches salt
4 large egg whites
1 cup granulated sugar
1/4 teaspoon cream of tartar
1 teaspoon pure vanilla extract
- First make the cake. Preheat oven to 350. Spray or butter two 9 inch round cake pans (this cake is high volume, so if you have 9 1/2 it might work a little better, but 9 inch works, just keep an eye or put them on a cookie sheet to avoid spills). Line your cake pans with circles of parchment paper, with most cakes, you can skip this step, but this is a moist and sticky cake and lining with parchment makes a big difference in how they come out so please do this. Coat parchment and pan with more cooking spray.
- In a medium bowl, whisk together flour, cracker and cookie crumbs, baking powder, baking soda, salt, and spices. Set aside. In a large mixing bowl cream butter and sugars together until light and fluffy. Add eggs one at a time, scraping the bowl down after each addition. Add a third of the dry ingredients, then half the buttermilk, a third of the dry ingredients, the remaining buttermilk, and then the remaining dry ingredients, mixing between additions until combined. Scrape down the bowl, and mix again briefly if needed.
- Divide the batter evenly between the prepared cake pans, smoothing tops. Bake until a toothpick inserted into the center comes out clean, about 30-35 minutes. Cool in pan on rack, then run a knife between the cake edges and pans before turning out onto a rack to cool. Let cool completely, a process you can speed up in the fridge.
- To make the filling, place the chocolate in a heatproof bowl. Combine the heavy cream and salt in a small saucepan, and bring to a simmer. Pour over the chocolate, and let sit for 1 minute, then whisk until smooth. Set bowl over another bowl filled with ice water, and stir it until it firms up to a spreadable consistency. You can let it cool down in the fridge, but it works best if you stir it every now and then so it cools evenly.
- To prepare the cake arrange a single layer on a serving platter, cake stand or cake board. For a neat looking cake, use a long serrated knife to level the top gently – they don’t puff up super big as some cakes do so it won’t be a lot, and you will find plenty of people willing to eat your cake scraps. Spread the chocolate thickly over the bottom layer. Place top layer over it and level this one too if you would like.
- To make the frosting place the egg whites, granulated sugar and cream of tartar in the heatproof bowl of an electric mixer. Set over a saucepan of simmering water. Whisk constantly until sugar is dissolved and whites are warm to the touch – about 3-5 minutes. Transfer the bowl to an electric mixer fitted with the whisk attachment. Beat starting at a low speed, gradually increasing to the high, until stiff, glossy peaks form, 4-7 minutes. Add vanilla and mix until combined. You will want to use this frosting right away, it won’t keep well.
- Spread a thin layer of the frosting over the top and sides of the cake covering all the crumbs. Transfer cake to the fridge for 5-10 minutes to let it set. Next generously coat the top and sides with additional frosting making a pretty pattern. You could even pipe on big pretty peaks, but I just made it look artistic and delicious. Remove any flammable objects and people from the cake area and with a kitchen torch on a low setting, lightly brown the outside of your cake creating a toasted marshmallow effect.
Recipe adapted from S’more layer cake – Smitten Kitchen cookbook by Deb Perelman