Description
This technical recipe delivers a deeply moist chocolate sheet cake base, featuring Dutch-processed cocoa bloomed with hot coffee, perfectly balancing the acidity of buttermilk. It is layered with a structurally stable, salt-forward Swiss meringue peanut butter buttercream and topped with a rich, glossy chocolate ganache.
Ingredients
- All-Purpose Flour (210g)
- Dutch-Processed Cocoa Powder (75g)
- Sugar
- Baking Soda
- Baking Powder
- Salt
- Eggs
- Vanilla Extract
- Buttermilk (240ml)
- Neutral Oil
- Hot Coffee (240ml)
- Salted Butter
- Creamy Peanut Butter
- Heavy Cream
- Chopped Chocolate
Instructions
- Sift the flour, sugar, cocoa powder, baking soda, baking powder, and salt into a large mixing bowl. Use a wire whisk to distribute the leavening agents evenly through the flour.
- Introduce the eggs, vanilla extract, buttermilk, and oil into the dry mixture. Stir steadily until the flour is fully hydrated.
- Pour the hot coffee into the batter in a steady stream while stirring quickly to maximize the chocolate intensity and create a uniform crumb.
- Transfer the batter to a greased 16×10 inch sheet pan. Bake at 350°F (177°C) for 15 to 20 minutes. Test the center with a toothpick; it must come out clean.
- Prepare a bain-marie with simmering water. Combine egg whites, sugar, and salt in the bowl of a stand mixer and whisk over the steam until the sugar dissolves and the mixture reaches 120°F (49°C). Whisk on high speed until you achieve stiff, glossy peaks.
- Reduce the mixer speed and add the softened butter one tablespoon at a time. Continue whisking until silky. Finally, fold in the peanut butter on low speed until the frosting is uniform.
- Heat the heavy cream and sugar until just before the boiling point. Pour this over the chopped chocolate, butter, and vanilla. Let it sit for sixty seconds, then stir from the center outward to create a shiny, stable emulsion. Chill the ganache until firm but spreadable.
Notes
Ensure all ingredients for the cake batter are measured precisely by weight, especially the flour and cocoa, to guarantee the correct crumb structure needed to support the dense frosting. When preparing the Swiss meringue buttercream, make sure the butter is slightly softened but still cool—if it’s too warm, the meringue will deflate instantly upon incorporation. The sheet cake is easiest to frost and trim if slightly chilled after baking.
- Prep Time: 45 mins
- Cook Time: 20 mins
- Category: Dessert
- Method: Baking
- Cuisine: American