Costco’s bakery continues to be a favorite among shoppers in the U.S., thanks to its wide range of delicious, high-quality desserts at reasonable prices. One standout item is the Kirkland Signature Chocolate Mousse Cake. This premium dessert has consistently earned glowing reviews from chocolate lovers and is considered a must-try item for any Costco member.
In this comprehensive guide, you’ll learn everything about the Tuxedo Chocolate Mousse Cake—from its updated availability and price in 2025 to its ingredients, nutritional information, storage tips, and how you can recreate it at home.
Check out: Costco Tuxedo Cake
What Is Costco’s Tuxedo Chocolate Mousse Cake?
The Costco chocolate mousse cake, officially named the Kirkland Signature Tuxedo Chocolate Mousse Cake, is a visually stunning and indulgent dessert that combines several chocolate components. It is carefully layered to deliver a variety of textures and flavors in each bite.
Layers include:
- Moist chocolate cake base for structure and richness
- Velvety dark chocolate mousse, providing deep cocoa flavor
- Smooth white chocolate and vanilla mousse, offering a creamy contrast
- Rich chocolate ganache topping
- Decorative chocolate shards and curls on top for a bakery-style finish
The elegant black-and-white layers are what give it the “Tuxedo” name, reminiscent of a formal suit.
Availability and Price (Updated May 2025)
- Current price: Around $16.99 to $18.99 in most U.S. Costco warehouse stores
- Same-day delivery price: $21.05 via sameday.costco.com
- Weight: 42 ounces (2.63 pounds)
- Servings: Serves 12–16 people, depending on slice size
- Shelf life: Typically 5–7 days when refrigerated properly
- Where to find: In the refrigerated bakery section of most Costco Wholesale locations in the U.S.
This product is available year-round and frequently appears in Costco’s promotional bakery listings, especially around holidays.
Ingredients and Allergen Information
The Tuxedo Chocolate Mousse Cake contains the following key ingredients:
- Enriched wheat flour
- Cocoa powder
- Dark and white chocolate
- Sugar, eggs, milk
- Cream, butter, and soybean oil
Allergens: Wheat, milk, eggs, soy. Not suitable for gluten-free or vegan diets.
Nutrition Facts (Per Serving ~136g)
Understanding the nutritional profile is important for those watching their intake:
- Calories: ~463 kcal
- Total Fat: 27g
- Carbohydrates: 53g
- Sugars: 40g
- Protein: 5g
This dessert is indulgent and best enjoyed in moderation due to its high sugar and fat content.
Customer Feedback
- Taste: Rich, chocolate-forward, not overly sweet
- Texture: Light and creamy mousse, balanced by a dense cake base
- Presentation: Elegant and professional-looking, suitable for parties
- Freezability: Can be sliced and frozen; tastes great after thawing
Shoppers continue to call it a great value, often comparing it favorably to more expensive bakery cakes.
How to Store It Properly
To maintain freshness and flavor:
- Refrigerate immediately after purchase
- Keep covered to prevent the mousse from drying out
- Freeze individual slices if you want to extend shelf life; thaw in the refrigerator for best results
Recipe
Costco Chocolate Mousse Cake
Ingredients
For the Chocolate Cake Base:
- 1 cup all-purpose flour
- 1 cup granulated sugar
- 1/2 cup unsweetened cocoa powder
- 1/2 tsp baking powder
- 1/2 tsp baking soda
- 1/2 tsp salt
- 1 large egg
- 1/2 cup buttermilk
- 1/2 cup warm water
- 1/4 cup vegetable oil
- 1 tsp vanilla extract
For the Dark Chocolate Mousse:
- 1 cup heavy whipping cream chilled
- 1/2 cup dark chocolate chips melted and cooled slightly
For the White Chocolate Mousse:
- 1 cup heavy whipping cream chilled
- 1/2 cup white chocolate chips melted and cooled slightly
For the Chocolate Ganache:
- 1/2 cup heavy cream
- 3/4 cup semisweet chocolate chips
Optional Toppings:
- Chocolate curls or shavings
- Cocoa powder or sprinkles
Instructions
Make the Cake Base:
- Preheat oven to 350°F (175°C). Grease and line a 9-inch round cake pan.
- In a large bowl, whisk together flour, sugar, cocoa powder, baking powder, baking soda, and salt.
- In a separate bowl, mix egg, buttermilk, warm water, oil, and vanilla extract.
- Combine wet and dry ingredients and mix until smooth.
- Pour batter into the prepared pan and bake for 25–30 minutes, or until a toothpick inserted comes out clean.
- Let the cake cool completely, then level the top with a knife if needed.
Make the Mousse Layers:
- For each mousse, whip the cream until stiff peaks form.
- Fold in melted dark chocolate for one bowl, and white chocolate in another.
- Keep mousse chilled until ready to assemble.
Assemble the Cake:
- Place the cake layer at the bottom of a springform pan.
- Spread the dark chocolate mousse over the cake and smooth it with a spatula.
- Gently spread the white chocolate mousse on top of the dark mousse.
- Refrigerate the assembled cake for at least 4–6 hours (or overnight) to set.
Make the Ganache:
- Heat the heavy cream in a small saucepan until simmering (not boiling).
- Pour over semisweet chocolate chips and let sit for 1 minute.
- Stir until smooth and glossy.
- Cool slightly, then pour over the set mousse layers and spread evenly.
Decorate and Serve:
- Top with chocolate curls or shavings for decoration.
- Return to the fridge for another hour if needed before slicing.
- Serve chilled and enjoy!
Video
Notes
- For extra stability, you can add 1 tsp unflavored gelatin to each mousse layer if serving in warm environments.
- Freeze extra slices wrapped in plastic wrap and foil for up to 2 months.