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Rich Chocolate Mousse Cake Recipe

A plush cocoa-coffee cake base topped with silky chocolate mousse and a glossy ganache cap, finished with chocolate-kissed whipped cream. This make-ahead showstopper eats like a bakery dessert and slices beautifully.
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Prep Time: 45 minutes
Cook Time: 35 minutes
Total Time: 1 hour 20 minutes
Servings: 12

Ingredients
 

Chocolate Cake Base

  • 2/3 cup granulated sugar (about 130 g)
  • 1/3 cup neutral vegetable oil (80 ml)
  • 2 large eggs, room temperature
  • 1 1/2 teaspoons pure vanilla extract
  • 1/3 cup full-fat sour cream (80 g), room temperature
  • 1 cup all-purpose flour (130 g), sifted
  • 1/3 cup Dutch-process cocoa powder (28 g), sifted
  • 1 teaspoon baking powder
  • 1/2 teaspoon baking soda
  • 1/2 teaspoon fine sea salt
  • 1/2 cup hot brewed coffee plus 2 tablespoons (150 ml) total
  • 1/2 teaspoon instant espresso powder

Chocolate Mousse

  • 5 ounces dark chocolate (60–70%), finely chopped (140 g)
  • 1 teaspoon unflavored powdered gelatin
  • 2 tablespoons cold heavy whipping cream (for blooming gelatin)
  • 1 1/4 cups heavy whipping cream (300 ml), very cold
  • 8 ounces cream cheese, room temperature (226 g)
  • 1/3 cup powdered sugar (40 g)
  • 3 tablespoons granulated sugar (38 g)
  • 1 tablespoon unsweetened cocoa powder (about 6 g)
  • 1 teaspoon pure vanilla extract

Ganache Topping

  • 4 ounces dark chocolate, chopped (113 g)
  • 1/2 cup heavy whipping cream (120 ml)
  • 1 pinch fine sea salt

Chocolate Whipped Cream (optional finish)

  • 3/4 cup heavy whipping cream (180 ml), cold
  • 2 tablespoons powdered sugar (16 g)
  • 1 tablespoon unsweetened cocoa powder (about 5 g)
  • 1/2 teaspoon pure vanilla extract

Instructions

Preparation Steps

  • Line the base of an 8-inch springform pan with parchment and lightly grease the sides. For clean layers later, add a tall parchment or acetate collar inside the rim.
  • Heat the oven to 340°F (171°C). In a heatproof cup, stir the espresso powder into the hot coffee and whisk in the sifted cocoa until smooth; set aside to cool to warm.
  • Whisk sugar, oil, vanilla, and sour cream in a large bowl until glossy. Beat in the eggs one at a time until the mixture looks slightly thickened and homogeneous.
  • Sift flour, baking powder, baking soda, and salt together. Add half of the dry mix to the wet bowl, stir just to combine, then add all the cocoa-coffee mixture. Add remaining dry mix and fold gently until no dry streaks remain; scrape the bowl bottom once to ensure it's evenly mixed.
  • Pour batter into the prepared springform and bake 30–35 minutes, until a tester in the center comes out with a few moist crumbs. Cool 10 minutes on a rack, then level the top if domed; keep the cake in the pan for assembly and let it cool to room temperature.
  • While the cake bakes, start the mousse: Sprinkle gelatin over 2 tablespoons of cold heavy cream in a small dish and let it hydrate for 3 minutes (it will look thick).
  • Melt the chopped chocolate in a heatproof bowl set over barely simmering water (double boiler), stirring until smooth. Microwave the bloomed gelatin for 5–7 seconds just to liquefy, then whisk it into the warm melted chocolate. Set aside to cool to lukewarm—no warmer than body temperature.
  • In a chilled bowl, whip 1 1/4 cups cold heavy cream to soft peaks; refrigerate briefly while you prepare the cream cheese base.
  • Beat cream cheese until completely smooth. Add powdered sugar, granulated sugar, cocoa, and vanilla; beat until velvety with no lumps. Mix in the melted chocolate-gelatin mixture until fully combined, scraping the bowl once. Fold in the whipped cream in two additions until the mousse is airy and uniform.
  • Spread the mousse over the cooled cake still in the springform, smoothing the top. Tap the pan gently to release air bubbles. Chill until just set, 45–60 minutes (or 20–25 minutes in the freezer).
  • For ganache, heat cream in a small saucepan until steaming with tiny bubbles around the edge. Pour over the chopped chocolate with a pinch of salt; let stand 2 minutes, then stir from the center outward until glossy. Cool to about 90–95°F—fluid but not hot.
  • Pour ganache over the set mousse and tilt the pan to coat evenly. Chill 20–30 minutes until the surface is softly set.
  • Optional finish: Whip 3/4 cup cold cream with powdered sugar, cocoa, and vanilla to medium-stiff peaks. Pipe rosettes around the edge. Refrigerate the cake at least 2 hours (or overnight) before unmolding and slicing.

Notes

Run a thin knife around the collar before releasing the springform, and slice with a chef’s knife warmed under hot water and wiped dry for super-clean cuts.
Store covered in the refrigerator for up to 3 days; the texture is best if you let slices sit at room temperature for 10–15 minutes before serving.
This recipe is an original creation inspired by classic Rich Chocolate Mousse Cake Recipe flavors. All ingredient ratios and instructions are independently developed.