I learned how to balance dark and white chocolate in this tuxedo cake after one joyful, messy afternoon of experimentation. This is a two-layer chocolate cake filled with alternating dark and white chocolate mousse, finished with a glossy chocolate ganache. It looks elegant without requiring advanced techniques, which is exactly why home bakers reach for it for birthdays, dinner parties, or any time they want a dramatic dessert. If you’re curious how other bakers build that same layered effect, take a look at this tuxedo cake triple chocolate mousse cake for another take on the concept.

Why you’ll love this dish

This tuxedo cake gives you classic chocolate flavor with textural contrast. The cake itself is moist and tender because the boiling water blooms the cocoa and thins the batter for even crumb. The mousses add light, airy richness so each bite feels indulgent rather than heavy. It’s a show-stopper that you can mostly make ahead: bake the layers one day, assemble the next, then chill to let the mousse set. Families love it for celebrations, and it scales well if you need a larger or smaller version.

Step-by-step overview

You’ll start by making a simple chocolate cake batter that becomes thin once the boiling water is stirred in. Bake two 9-inch rounds, cool them completely, then alternate a layer of dark chocolate mousse and a layer of white chocolate mousse between the cake rounds. Finish with a smooth chocolate ganache over the top and sides, then chill until firm. The major stages are: mix and bake, cool, layer with mousses, ganache finish, and chill.

What you’ll need

• 2 cups all-purpose flour
• 2 cups granulated sugar
• 3/4 cup unsweetened cocoa powder (use Dutch-processed for a mellow flavor or natural cocoa for brightness)
• 1 1/2 teaspoons baking powder
• 1 1/2 teaspoons baking soda
• 1 teaspoon salt
• 2 large eggs, room temperature
• 1 cup whole milk (substitute buttermilk for a tangier crumb)
• 1/2 cup vegetable oil (neutral oil keeps crumb tender; melted butter gives more flavor)
• 2 teaspoons vanilla extract
• 1 cup boiling water
• 1 1/2 cups dark chocolate mousse (store-bought or homemade)
• 1 1/2 cups white chocolate mousse (store-bought or homemade)
• 1 cup chocolate ganache (about equal parts chocolate and cream by weight; warm for pouring)

Notes: If you need a dairy-free version, swap to a plant milk and use dairy-free chocolate for mousses and ganache. For gluten-free, use a 1:1 gluten-free flour blend and expect a slightly different crumb.

Step-by-step instructions

1. Preheat the oven to 350°F (175°C). Grease and lightly flour two 9-inch round cake pans. Line bottoms with parchment for easy removal.
2. In a large bowl, whisk together flour, sugar, cocoa powder, baking powder, baking soda, and salt until evenly combined.
3. Add the eggs, milk, vegetable oil, and vanilla. Beat on medium speed for 2 minutes until the batter is smooth and slightly aerated.
4. Carefully stir in the boiling water until the batter is fully combined. The batter will be thin; that is normal.
5. Divide the batter evenly between the prepared pans. Bake for 30 to 35 minutes, or until a toothpick inserted in the center comes out clean or with a few moist crumbs.
6. Let the cakes rest in pans for 10 minutes. Run a knife around the edges, invert onto wire racks, peel off parchment, and cool completely.
7. Once cooled, place one cake layer on your serving plate. Spread 3/4 cup dark chocolate mousse evenly over the top. Add the second cake layer and spread 3/4 cup white chocolate mousse on top. Adjust layers if you prefer a thinner or thicker mousse layer.
8. Chill the layered cake for at least 30 minutes to firm the mousse slightly.
9. Warm the chocolate ganache until pourable, then pour and smooth it over the top and sides of the chilled cake. Use an offset spatula for a clean finish.
10. Refrigerate the finished cake for at least 2 hours, or until the mousse is set and the ganache has firmed up. Remove from the fridge 15 minutes before slicing for easier cutting.

Best ways to enjoy it

Serve slices chilled for clean layers and best mousse texture. Garnish with chocolate shavings, a dusting of cocoa, or toasted nuts for crunch. For a bright contrast, plate each slice with a spoonful of fresh raspberries or a tart berry coulis. If you want another dramatic cake on the table, pair plates alongside Blackberry Velvet Gothic Cake to offer a fruity option for guests.

Storage and reheating tips

Store this cake refrigerated because mousse and ganache contain dairy. Keep it covered with a cake dome or loosely with plastic wrap to prevent drying and odor absorption. It will keep well in the refrigerator for 3 days. For longer storage, freeze individual slices wrapped tightly in plastic and foil for up to 1 month. Thaw in the refrigerator overnight. Do not leave mousse-filled cake at room temperature for more than 2 hours for food safety.

Pro chef tips

• Use room temperature eggs and milk for a better-emulsified batter and even rise.
• Sift cocoa and dry ingredients to avoid lumps and to aerate the mix.
• When you add boiling water, mix gently and do not overwork the batter; the heat activates the cocoa and produces a moister cake.
• Chill layers before ganache: slightly firm mousse prevents the ganache from absorbing and losing its glossy finish.
• For a smooth ganache finish, pour when ganache is warm but not hot, and use a turntable to smooth it quickly.

Creative twists

• Add 1 tablespoon instant espresso powder to the batter to deepen chocolate flavor without a coffee taste.
• Swirl a thin raspberry or salted caramel layer between mousses for fruity or salty contrast.
• Make cupcakes: portion the batter into muffin tins and top each cooled cupcake with a dollop of alternating mousses.
• For a nutty version, fold finely chopped toasted hazelnuts into the dark mousse.
• Convert to dairy-free: use coconut cream for mousses and dairy-free chocolate for ganache.

Helpful answers

How long does this tuxedo cake take from start to finish?

Hands-on time is about 30 to 45 minutes for mixing, plus 30 to 35 minutes baking, cooling time of at least an hour, and at least 2 hours of chilling after assembly. Plan for roughly 4 hours total, though you can split the work across two days.

Can I make the mousse and ganache ahead of time?

Yes. Mousses and ganache can be made a day in advance and refrigerated. For best texture, whip mousses fresh or gently rewhip if they deflate. Warm ganache slightly to pour if it thickens too much in the fridge.

What if my cake turns out dense or too wet?

Dense cake can come from overmeasuring flour or underbeating. For a lighter crumb, spoon and level the flour instead of scooping. If the cake is too wet after baking, check your oven temperature with an oven thermometer; an oven running cool can leave cakes underbaked. Bake a few extra minutes and test with a toothpick.

Can I use store-bought mousse or ganache?

Yes. High-quality store-bought mousses and ganache work fine and save time. Taste them first to ensure sweetness and chocolate intensity match your preference before assembling.

Is there a good way to get clean slices?

Chill the cake until the mousse is firm. Wipe your knife clean between cuts and warm the blade briefly under hot water, drying it before slicing each time. This yields neat layers and tidy plates.

Tuxedo Cake

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A two-layer chocolate cake filled with alternating dark and white chocolate mousse, finished with a glossy chocolate ganache.

• Prep Time: 45 minutes
• Cook Time: 35 minutes
• Total Time: 180 minutes
• Yield: 12 servings 1x
• Category: Dessert
• Method: Baking
• Cuisine: American
• Diet: Vegetarian

Ingredients

Scale 1x2x3x

• 2 cups all-purpose flour
• 2 cups granulated sugar
• 3/4 cup unsweetened cocoa powder
• 1 1/2 teaspoons baking powder
• 1 1/2 teaspoons baking soda
• 1 teaspoon salt
• 2 large eggs, room temperature
• 1 cup whole milk
• 1/2 cup vegetable oil
• 2 teaspoons vanilla extract
• 1 cup boiling water
• 1 1/2 cups dark chocolate mousse
• 1 1/2 cups white chocolate mousse
• 1 cup chocolate ganache

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Instructions

1. Preheat the oven to 350°F (175°C). Grease and lightly flour two 9-inch round cake pans.
2. Whisk together flour, sugar, cocoa powder, baking powder, baking soda, and salt until evenly combined.
3. Add the eggs, milk, vegetable oil, and vanilla. Beat on medium speed for 2 minutes until the batter is smooth.
4. Stir in the boiling water until the batter is fully combined. The batter will be thin; that is normal.
5. Divide the batter evenly between the prepared pans. Bake for 30 to 35 minutes, or until a toothpick comes out clean.
6. Let the cakes rest in pans for 10 minutes before inverting onto wire racks to cool completely.
7. Once cooled, place one cake layer on your serving plate. Spread 3/4 cup dark chocolate mousse over the top.
8. Add the second layer and spread 3/4 cup white chocolate mousse on top.
9. Chill the cake for at least 30 minutes to set the mousse.
10. Warm the ganache until pourable, then pour it over the top and sides.
11. Refrigerate the cake for at least 2 hours or until the mousse is set.

Notes

For a dairy-free version, substitute plant milk and use dairy-free chocolate for the mousses and ganache. For gluten-free, use a 1:1 gluten-free flour blend.

Nutrition

• Serving Size: 1 slice
• Calories: 400
• Sugar: 35g
• Sodium: 400mg
• Fat: 18g
• Saturated Fat: 7g
• Unsaturated Fat: 8g
• Trans Fat: 0g
• Carbohydrates: 52g
• Fiber: 3g
• Protein: 6g
• Cholesterol: 50mg