I love chocolate cakes, but the Costco Tuxedo Cake is something special. It’s the kind of dessert that turns a simple dinner into a celebration. The Costco Tuxedo Cake is a showstopper dessert that always steals the spotlight. It’s made of moist chocolate cake layers, creamy white and dark chocolate mousse, and a glossy ganache topping that glistens beautifully. The flavor is rich, the texture is smooth, and it feels like a professional bakery treat that you can make right at home. The contrast between the dark chocolate and the light, fluffy white mousse makes every bite heavenly. It’s decadent without being overwhelming, and it never fails to impress my family and friends.

I have made this cake countless times, especially during birthdays or holidays. I use premium chocolate and fresh whipping cream — always! Those two ingredients truly define the taste and texture.

You can serve it for dinner parties, some chilled slices with coffee, also with fresh berries on the side for a burst of color and freshness.

It’s Perfect For:

• Birthdays and anniversary celebrations
• Holiday feasts or special family dinners
• Romantic date nights at home
• Office or potluck dessert tables
• A weekend treat for chocolate lovers

Ingredients

For the Chocolate Cake Layers:

• 1 ½ cups all-purpose flour
• 1 ½ teaspoons baking powder
• 1 teaspoon baking soda
• ¾ cup unsweetened cocoa powder
• 1 ¾ cups granulated sugar
• ½ teaspoon salt
• 2 large eggs
• 1 cup buttermilk (or 1 cup milk + 1 tbsp vinegar, rested for 5 minutes)
• ½ cup vegetable oil
• 2 teaspoons vanilla extract
• 1 cup hot coffee or boiling water

For the White Chocolate Mousse:

• 1 cup white chocolate chips
• 1 ½ cups heavy whipping cream, divided
• 2 tablespoons powdered sugar
• ½ teaspoon vanilla extract

For the Dark Chocolate Mousse:

• 1 cup dark or semi-sweet chocolate chips
• 1 ½ cups heavy whipping cream, divided
• 2 tablespoons powdered sugar
• ½ teaspoon vanilla extract

For the Ganache Topping:

• 1 cup dark chocolate chips
• ¾ cup heavy cream
• 1 tablespoon butter (optional, for shine)

Optional Garnish:

• Chocolate shavings, curls, or dusting of cocoa powder

Kitchen Equipment You’ll Need:

• 2 round 8-inch cake pans
• Mixing bowls (large and medium)
• Electric mixer or hand whisk
• Spatula and offset knife
• Saucepan for ganache
• Parchment paper
• Measuring cups and spoons

How to Make Costco Tuxedo Cake

Step 1

Prepare the chocolate cake layers: Preheat your oven to 350°F (175°C). Grease and line two 8-inch round cake pans with parchment paper. In a large bowl, sift together flour, cocoa, baking powder, baking soda, sugar, and salt. In another bowl, whisk eggs, buttermilk, oil, and vanilla. Gradually add wet ingredients to the dry, mixing just until combined. Slowly pour in hot coffee and whisk until the batter becomes smooth and slightly runny — this gives the cake its moist, rich texture. Divide the batter between pans and bake for 30–35 minutes, or until a toothpick inserted comes out clean. Let them cool completely on a wire rack.

Step 2

Make the white chocolate mousse: In a small saucepan, heat ½ cup of the cream just until simmering. Pour it over the white chocolate chips in a heatproof bowl. Let it sit for a minute, then stir until smooth and creamy. Chill for 15 minutes, then whip the remaining cream with powdered sugar and vanilla until soft peaks form. Fold the whipped cream into the melted white chocolate mixture until airy and smooth. Refrigerate to set slightly.

Step 3

Make the dark chocolate mousse: Repeat the same process with the dark chocolate. Heat ½ cup cream, pour over chocolate chips, stir until smooth, and let cool slightly. Whip the remaining cream with powdered sugar and vanilla, then fold into the chocolate mixture. Chill until thickened.

Step 4

Assemble the cake: Slice each cake layer horizontally (optional for 4 thinner layers). Place one chocolate cake layer on your serving plate, spread a generous layer of white chocolate mousse. Add another cake layer, then spread dark chocolate mousse evenly. Repeat until you reach the top layer. Use an offset spatula to smooth the sides and top for an even, elegant finish.

Step 5

Prepare the ganache: Heat cream in a saucepan until hot but not boiling. Pour it over the chocolate chips and let it sit for 1 minute. Add butter (if using) and stir until glossy. Allow it to cool slightly so it thickens but is still pourable.

Step 6

Glaze and chill: Pour ganache over the assembled cake, letting it drip down the sides for that signature tuxedo look. Decorate with chocolate curls or cocoa powder. Refrigerate for at least 2 hours before serving to allow the layers to firm and flavors to meld.

Tips for Making the Best Tuxedo Cake

• Always use quality chocolate. A good brand of chocolate gives a richer, smoother taste. Avoid compound chocolate—it’s worth investing in real cocoa butter chocolate.
• Avoid overmixing your batter. Overmixing develops gluten and makes the cake dense. Mix until ingredients are just combined for a lighter crumb.
• Chill the mousse before layering. Give the mousse 15–20 minutes in the fridge between layers. It keeps them neat and distinct.
• Whip your cream properly. Soft peaks are key! Overwhipped cream turns grainy and can ruin the mousse texture.
• Pour ganache at the right time. Wait until the ganache is thick but still pourable—too hot and it melts your mousse; too cold and it won’t spread evenly.
• Level your cakes. Trim the domed tops so the layers stack beautifully and stay stable during assembly.
• Chill overnight for best results. Resting the cake overnight lets the flavors deepen and the texture become perfectly firm.

Optional Ingredients

• Espresso powder – enhances chocolate depth.
• Raspberry jam – adds tart contrast.
• Caramel sauce – for a sweet buttery layer.
• Crushed nuts – gives a crunchy surprise.
• Sea salt flakes – to balance sweetness.
• Edible gold dust – for a stunning presentation.

How to Serve Costco Tuxedo Cake

I love serving this cake slightly chilled because the mousse and ganache have the perfect texture when cold. It’s creamy, smooth, and firm enough to hold its beautiful layers. When serving guests, I slice the cake with a sharp knife dipped in warm water for clean edges, wiping the blade after each slice. Presentation matters—it makes every piece look picture-perfect.

I also like adding a touch of elegance by dusting cocoa powder or grated chocolate curls over the top. Sometimes I drizzle a little raspberry coulis or caramel on the plate before placing the slice—it gives that restaurant-style finish. For family gatherings, I serve it with scoops of vanilla or coffee ice cream, which melt slowly beside the cake and complement its rich flavor.

If I’m hosting a larger event, I serve it in smaller portions with coffee or tea. For something more festive, a glass of red wine or champagne works beautifully. The cake pairs perfectly with beverages that balance its sweetness. The layers of mousse make every bite soft and satisfying, so a small slice truly goes a long way.

Is Costco Tuxedo Cake Healthy?

This cake is definitely a dessert to enjoy in moderation. It’s rich, creamy, and full of sugar and chocolate—but that’s what makes it special! It’s not meant to be an everyday treat, but an indulgent dessert for moments worth celebrating.

If you want to make it a little healthier, use dark chocolate with at least 70% cocoa, reduce the sugar in the mousse, and use lighter cream. You can even swap part of the butter for Greek yogurt to reduce fat without losing the creamy texture.

Variations and Substitutions

• Gluten-Free Version: Swap regular flour for a gluten-free baking mix and add a pinch of xanthan gum for structure. The cake remains moist and delicious.
• Vegan Tuxedo Cake: Use almond milk, coconut cream, and vegan chocolate. Replace eggs with flaxseed meal and water for a plant-based option.
• Coffee Lover’s Cake: Add a tablespoon of espresso powder to the batter and ganache for an irresistible mocha flavor.
• Strawberry Mousse Twist: Mix strawberry puree into the white chocolate mousse for a fruity layer that brightens the flavor.
• Peanut Butter Layer: Add a thin layer of peanut butter or peanut mousse between cake and ganache for a salty-sweet balance.
• Caramel Tuxedo Cake: Drizzle salted caramel between layers and on top for extra indulgence. It complements the chocolate perfectly.
• Oreo Tuxedo Cake: Crush Oreo cookies and mix them into the white mousse layer for crunch and extra chocolate flavor.
• Mini Tuxedo Cupcakes: Make smaller versions using cupcake tins. Perfect for parties, easy to serve, and just as stunning.

How to Store and Reheat

Store the cake in an airtight container or cover it tightly with plastic wrap. Keep it refrigerated for up to 4 days. The mousse layers stay firm and flavorful when chilled.

Avoid reheating in the microwave—this can ruin the mousse texture. If you want it less cold, simply let it sit at room temperature for 10–15 minutes before serving. The layers soften naturally and taste just right.

Frequently Asked Questions About Costco Tuxedo Cake

Can I make the cake a day ahead?
Yes, you should! The cake actually tastes better the next day because the flavors blend and the mousse sets perfectly.

Can I freeze the tuxedo cake?
Definitely. Wrap it tightly in plastic wrap and freeze for up to 1 month. Thaw it overnight in the fridge before serving for best texture.

What can I use if I don’t have buttermilk?
Just mix 1 cup of milk with 1 tablespoon of vinegar or lemon juice, let it sit for 5 minutes, and you have homemade buttermilk.

Can I replace the mousse with frosting?
You can, but it won’t have the same light, creamy texture. The mousse is what makes it feel so luxurious and close to Costco’s version.

Costco Tuxedo Cake Recipe

Recipe by Maria MeyerCourse: DessertCuisine: AmericanDifficulty: Medium

Servings

10

servings

Prep time

25

minutes

Cooking time

35

minutes

Chilling time

2

hours

 Recreate the famous Costco Tuxedo Cake at home with this easy recipe featuring moist chocolate layers, creamy mousse, and glossy ganache. Perfect for birthdays, holidays, and every special occasion!

Ingredients

• For the Chocolate Cake Layers:

• 1 ½ cups all-purpose flour

• 1 ½ teaspoons baking powder

• 1 teaspoon baking soda

• ¾ cup unsweetened cocoa powder

• 1 ¾ cups granulated sugar

• ½ teaspoon salt

• 2 large eggs

• 1 cup buttermilk (or 1 cup milk + 1 tbsp vinegar, rested for 5 minutes)

• ½ cup vegetable oil

• 2 teaspoons vanilla extract

• 1 cup hot coffee or boiling water

• For the White Chocolate Mousse:

• 1 cup white chocolate chips

• 1 ½ cups heavy whipping cream, divided

• 2 tablespoons powdered sugar

• ½ teaspoon vanilla extract

• For the Dark Chocolate Mousse:

• 1 cup dark or semi-sweet chocolate chips

• 1 ½ cups heavy whipping cream, divided

• 2 tablespoons powdered sugar

• ½ teaspoon vanilla extract

• For the Ganache Topping:

• 1 cup dark chocolate chips

• ¾ cup heavy cream

• 1 tablespoon butter (optional, for shine)

• Optional Garnish:

• Chocolate shavings, curls, or dusting of cocoa powder

Directions

• Prepare the chocolate cake layers: Preheat your oven to 350°F (175°C). Grease and line two 8-inch round cake pans with parchment paper. In a large bowl, sift together flour, cocoa, baking powder, baking soda, sugar, and salt. In another bowl, whisk eggs, buttermilk, oil, and vanilla. Gradually add wet ingredients to the dry, mixing just until combined. Slowly pour in hot coffee and whisk until the batter becomes smooth and slightly runny — this gives the cake its moist, rich texture. Divide the batter between pans and bake for 30–35 minutes, or until a toothpick inserted comes out clean. Let them cool completely on a wire rack.
• Make the white chocolate mousse: In a small saucepan, heat ½ cup of the cream just until simmering. Pour it over the white chocolate chips in a heatproof bowl. Let it sit for a minute, then stir until smooth and creamy. Chill for 15 minutes, then whip the remaining cream with powdered sugar and vanilla until soft peaks form. Fold the whipped cream into the melted white chocolate mixture until airy and smooth. Refrigerate to set slightly.
• Make the dark chocolate mousse: Repeat the same process with the dark chocolate. Heat ½ cup cream, pour over chocolate chips, stir until smooth, and let cool slightly. Whip the remaining cream with powdered sugar and vanilla, then fold into the chocolate mixture. Chill until thickened.
• Assemble the cake: Slice each cake layer horizontally (optional for 4 thinner layers). Place one chocolate cake layer on your serving plate, spread a generous layer of white chocolate mousse. Add another cake layer, then spread dark chocolate mousse evenly. Repeat until you reach the top layer. Use an offset spatula to smooth the sides and top for an even, elegant finish.
• Prepare the ganache: Heat cream in a saucepan until hot but not boiling. Pour it over the chocolate chips and let it sit for 1 minute. Add butter (if using) and stir until glossy. Allow it to cool slightly so it thickens but is still pourable.
• Glaze and chill: Pour ganache over the assembled cake, letting it drip down the sides for that signature tuxedo look. Decorate with chocolate curls or cocoa powder. Refrigerate for at least 2 hours before serving to allow the layers to firm and flavors to meld.