White Chocolate Mocha Cake

4.81 from 21 votes

White Chocolate Mocha Cake

This white chocolate mocha cake pairs tender white chocolate espresso cake layers with a whipped white chocolate ganache and silky espresso buttercream.

Course Dessert

Cuisine American

Prep Time 2

Cook Time 40

Ganache Resting Time 3

Total Time 5 40

Servings

Calories 918kcal

Author Olivia

Ingredients

White Chocolate Mocha Cake:

140 g white chocolate chopped (or white chocolate chips)
1 1/2 cups milk
1 Tbsp instant espresso powder
2 1/2 cups all-purpose flour
2 1/2 tsp baking powder
1/2 tsp salt
3/4 cup unsalted butter room temperature
1 1/2 cups granulated sugar
3 large eggs room temperature
1 tsp vanilla extract

Espresso Swiss Meringue Buttercream:

3 large egg whites
1 cups granulated sugar
1 1/2 cups unsalted butter room temperature
1 1/2 Tbsp instant espresso powder more or less to taste

White Chocolate Ganache:

450 g white chocolate finely chopped
150 g heavy cream
bright white color gel

Assembly:

US Customary - Metric

Instructions

White Chocolate Mocha Cake:

Heat milk and chocolate until melted and combined.* Add espresso powder and stir until dissolved. Cool to room temperature.
Preheat oven to 350F. Grease and flour three 6" cake rounds and line with parchment.
In a medium bowl, whisk flour, baking powder, and salt until well combined. Set aside.
Using a stand mixer fitted with a paddle attachment, cream butter and sugar on med-high until pale and fluffy (approx 3mins). Reduce speed and add eggs one at a time fully incorporating after each addition. Add vanilla.
Alternate adding flour mixture and milk mixture, beginning and ending with flour (4 additions of flour and 3 of milk). Fully incorporating after each addition.
Bake for about 40mins or until a toothpick inserted into the center comes out mostly clean.
Place cakes on wire rack to cool for 10mins then turn out onto wire rack and cool completely.

Espresso Swiss Meringue Buttercream:

Place egg whites and sugar into the bowl of a stand mixer, whisk until combined.**
Place bowl over a double boiler on the stove and whisk constantly until the mixture is hot and no longer grainy to the touch (approx. 3mins). Or registers 160F on a candy thermometer.
Place bowl on your stand mixer and whisk on med-high until the meringue is stiff and cooled (the bowl is no longer warm to the touch (approx. 5-10mins)).
Switch to paddle attachment. Slowly add cubed butter and mix until smooth.***
Add espresso powder and whip until smooth.****

White Chocolate Ganache:

Place chopped chocolate and cream in a microwave safe bowl. Microwave in 5-10 second increments, stirring in between, until smooth and combined. Set aside to cool completely and thicken.
Remove 2/3 cup of the thickened white chocolate ganache, set aside. Whip remaining ganache until light and fluffy.

White Chocolate Drip:

If needed, microwave the the 2/3 cup ganache you set aside at very small increments (3 seconds) to thin out. Add a few drops of bright white color gel if desired.

Assembly:

Place one layer of cake on a cake stand or serving plate. Top with half of the whipped ganache, spread evenly. Repeat with remaining layers and crumb coat the cake with any remaining ganache. Chill for 20mins until ganache is set.
Frost and smooth the sides with the espresso buttercream, reserving some for the rope border on top. Chill for 30mins until frosting is cold and firm.
Using a small spoon, place dollops of white chocolate ganache around the top edges of the chilled cake, allowing some to drip down. Fill in the top of the cake with more ganache and spread evenly with an offset spatula. Chill to set ganache (5 mins).
Pipe a rope border on top using a Wilton 1M tip. Sprinkle small and large white nonpareils on top as well as some chocolate crispearls if desired. Roughly toss some small nonpareils onto the sides of the cake if desired. Place coffee beans along the bottom.

Notes

* You can do this in the microwave, stirring between 30 second bursts or in a pot in the stove, stirring constantly, or in a double boiler, stirring occasionally.

** Wipe your mixer bowl and whisk down with lemon juice or vinegar to make sure it is completely grease-free and make sure there is no trace of yolk in your whites or your meringue will not stiffen.

*** The buttercream may look like it's curdled at some point. Keep mixing until it is completely smooth. If it looks soupy, place it in the fridge for 20mins and rewhip.

**** If your instant espresso is not a superfine powder, I recommend dissolving it first in 1-2 tsp hot water and cooling before adding to the frosting.

The inspiration for this cake came from Summer over at Cake Paper Party.

Nutrition

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