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Chocolate Raspberry Mousse Cake

Chocolate raspberry mousse cake with an Oreo crust, silky dark chocolate mousse, and pale raspberry mousse set by gelatin for clean sliceable layers. Chilled, unmolded, and finished with fresh raspberries, dark chocolate shavings, and a quick powdered-sugar dusting—no mirror glaze required.
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Prep Time 1 hour
freezing 4 hours 30 minutes
Total Time 5 hours 30 minutes
Servings: 8 servings
Course: Dessert
Cuisine: American
Calories: 440
Ingredients Equipment Method Notes

Ingredients
  

Oreo crust
  • 2 cup Oreo crumbs Crush into fine crumbs.
  • 5 tbsp butter Melted, then mixed with crumbs.
Chocolate layer
  • 200 g dark chocolate Chopped for easier melting.
  • 1.5 cup heavy cream Whipped to soft peaks.
  • 2 tbsp sugar Stabilizes and sweetens the mousse.
Fresh raspberry layer
  • 2 cup raspberries Blended smooth and strained to remove seeds.
  • 1 tbsp gelatin Bloom in water before warming.
  • 1 tbsp water For blooming gelatin.
  • 1 cup heavy cream Whipped to medium peaks.
Topping
  • 1 cup raspberries Kept whole for the top layer.
  • 1 dark chocolate shavings Use a vegetable peeler or microplane.
  • 1 powdered sugar Dust right before serving.

Equipment

  • 1 sheet pan
  • 1 Dutch oven

Method
 

Chill the crust
  1. Press Oreo crumbs mixed with melted butter firmly into the base of a lined pan or springform. Chill for 20 min until set and firm (visual cue: matte, holding together when lightly pressed).
Freeze the chocolate layer
  1. Melt chopped dark chocolate and let it cool slightly, then fold it into whipped heavy cream with sugar. Pour over the chilled crust and freeze for 30 min until the surface is set (visual cue: no longer soft when gently tapped).
Make and add the raspberry mousse
  1. Bloom gelatin in 2 tbsp water until it looks thick and spongey, about 5 min. Warm the strained raspberry purée just until steam rises, then stir in the bloomed gelatin until fully dissolved (visual cue: smooth, no granules).
  2. Cool the raspberry mixture to room temperature, then fold it into whipped heavy cream gently until the mousse is evenly pale pink (visual cue: ribbons disappear and batter looks light and uniform).
  3. Pour the raspberry mousse over the frozen chocolate layer and smooth the top. Return to the freezer for 4+ hours to set firmly (visual cue: sliceable firmness).
Unmold and finish
  1. Unmold the cake and transfer to a serving plate without waiting long at room temperature (visual cue: clean edges). Arrange fresh whole raspberries on top, then shave dark chocolate over the berries and dust with powdered sugar immediately before serving (visual cue: powdered sugar stays white and doesn’t bleed).

Notes

Pro tip: strain the raspberry purée very thoroughly—if seeds remain, the gelatin mousse won’t feel silky. Store covered in the refrigerator for up to 2 days (best texture the day it’s finished). Freezing is yes: wrap airtight and freeze up to 1 month; thaw in the fridge for several hours. For a lighter option, you can use lactose-free heavy cream or a lighter whipped-cream substitute if your product whips well, but avoid sweetened mousse mixes that can change set.