Costco Tuxedo Cake Recipe

This Costco Tuxedo Cake Recipe is a rich and fudgy recipe, which is layered with fluffy dark chocolate mousse and white chocolate mousse. It’s the ultimate chocolate lover’s dessert, ready in about 3 hours and 25 minutes.

Jump to Recipe

Costco Tuxedo Cake Recipe Ingredients

For the Dark Chocolate Cake:

• 2 1/2 cups granulated sugar
• 2 1/4 cups all-purpose flour
• 3/4 cup dark or Dutch-processed cocoa powder
• 2 1/2 tsp baking powder
• 1 tsp fine salt
• 1 cup unsalted butter, room temperature
• 1 cup carton egg whites or 7 large egg whites, room temperature
• 1 1/2 cups buttermilk, room temperature
• 2 Tbsp vegetable or canola oil
• 2 tsp vanilla extract or vanilla bean paste
• 1 tsp instant espresso (optional)

For the Dark and White Chocolate Mousse:

• 1/2 cup good quality dark chocolate chips
• 1/3 cup warm water
• 1/4 cup dark or Dutch-processed cocoa powder
• 3/4 cup good quality white chocolate chips
• 2 1/3 cups cold heavy whipping cream, divided
• 1/4 cup powdered sugar
• 2 tsp vanilla extract or vanilla bean paste
• 1/2 tsp fine salt

For the Chocolate Ganache Frosting:

• 3/4 cup heavy whipping cream, room temperature
• 1 cup + 1 Tbsp dark (60-65% cocoa) chocolate chips
• 2 Tbsp unsalted butter, room temperature
• 1 Tbsp light corn syrup (optional)
• 1/4 tsp fine salt

For the Chocolate Simple Syrup (Optional):

• 1/2 cup water
• 1/2 cup granulated sugar
• 1 Tbsp unsweetened cocoa powder, sifted

How To Make Costco Tuxedo Cake

1. Make the Mousse Filling: In separate bowls, melt the dark chocolate chips and the white chocolate chips (with 1/3 cup of the heavy cream). In another small bowl, whisk the warm water and cocoa powder, then stir this into the melted dark chocolate. Let both chocolate mixtures cool. In a large, chilled bowl, whip the remaining 2 cups of heavy cream with powdered sugar, vanilla, and salt until stiff peaks form. Fold half of the whipped cream into the dark chocolate mixture and the other half into the white chocolate mixture. Cover and chill both mousses for at least 2 hours.
2. Make the Chocolate Ganache: Heat the 3/4 cup of heavy cream until just bubbling. Pour over the dark chocolate chips and let sit for 1 minute, then stir until smooth. Mix in the room temperature butter, corn syrup, and salt. Cover and let it cool and thicken at room temperature.
3. Make the Chocolate Cake Layers: Preheat oven to 350°F. Grease and line a 9×13-inch cake pan. In a large bowl, mix all dry cake ingredients. On low speed, mix in the butter until the mixture looks like sand. Add the egg whites, then the buttermilk in two parts. Finally, mix in the oil, vanilla, and espresso powder until just combined.
4. Bake the Cake: Pour the batter into the prepared pan and bake for 40-45 minutes, or until a toothpick inserted in the center comes out clean. Let the cake cool for 10 minutes in the pan, then turn it out onto a wire rack to cool completely.
5. Assemble the Tuxedo Cake: Once the cake is cool, use a serrated knife to level the top and then slice the cake in half horizontally to create two thin layers. Place the bottom layer on a cake stand.
6. Layer and Frost: If using, brush the bottom cake layer with chocolate simple syrup. Spread the dark chocolate mousse in an even layer, followed by the white chocolate mousse. Place the second cake layer on top and brush with more simple syrup.
7. Finish the Cake: Chill the cake for 15 minutes to firm up the mousse layers. Spread the thickened chocolate ganache over the top of the cake. Decorate as desired and chill until ready to serve.

Recipe Tips

• How do I get the fluffiest mousse? Chilling your mixing bowl and whisk attachment in the freezer for about 15 minutes before you start is a professional trick. It helps the heavy cream whip up faster and achieve a more stable, fluffy texture.
• How do I get clean layers? For a sharp, professional look, chill the cake for 15-20 minutes after adding the mousse layers and the final cake layer. This firms everything up, making it easier to apply the top layer of ganache cleanly.
• Can I make this cake ahead of time? Absolutely. This is a great cake to make in stages. The mousse, ganache, and cake layers can all be made 1-2 days in advance and stored separately in the refrigerator. Assemble the cake the day you plan to serve it.
• How to prevent a dry cake? The optional chocolate simple syrup is the secret. Brushing it onto the cake layers adds extra moisture and chocolate flavor, ensuring the cake stays tender for days.

What To Serve With Tuxedo Cake

This rich, decadent cake is a showstopper on its own. It pairs perfectly with simple accompaniments.

• A hot cup of black coffee or an espresso
• A small glass of milk
• A scoop of raspberry sorbet to cut the richness
• A handful of fresh raspberries

How To Store Tuxedo Cake

Refrigerate: This cake must be stored in the refrigerator due to the mousse and ganache. Cover it with plastic wrap or place it in a cake carrier. It will keep well for up to 3 days. Freeze: You can freeze the finished cake for up to a month. Wrap it well in plastic wrap and then a layer of foil. Thaw it overnight in the refrigerator before serving.

Costco Tuxedo Cake Nutrition Facts

• Serving: 1g
• Calories: 466kcal
• Carbohydrates: 52g
• Protein: 6g
• Fat: 27g
• Saturated Fat: 15g
• Polyunsaturated Fat: 10g
• Cholesterol: 64mg
• Sodium: 322mg
• Fiber: 1g
• Sugar: 40g

Nutrition information is estimated and may vary based on ingredients and serving size.

FAQs

Try More Recipes:

• Costco Pumpkin Roll Recipe
• Costco Pumpkin Streusel Muffin Recipe
• Costco Pumpkin Loaf Recipe