Dark Chocolate Mousse Cake

Ingredients

• 2 cups All-Purpose Flour (sifted)
• 1 cup Unsalted Butter (softened then melted for batter)
• 1.5 cups Granulated Sugar (room temperature)
• 0.5 cup Cocoa Powder (unsweetened, high quality)
• 2 tsp Baking Powder
• 1 tsp Baking Soda
• 0.5 tsp Salt
• 4 large Eggs (room temperature)
• 2 tsp Vanilla Extract (pure vanilla)
• 1 cup Milk (whole milk, room temperature)
• 8 oz Dark Chocolate (70% cocoa, high‑quality, chopped for batter)
• 2 tbsp Hot Water (just boiled)
• 8 oz Dark Chocolate (70% cocoa, chopped for mousse)
• 2 cups Heavy Cream (cold, for mousse)
• 1 cup Heavy Cream (warm, for ganache)
• 8 oz Dark Chocolate (70% cocoa, chopped for ganache)

Instructions

1. Prepare Dry Ingredients

   Sift together the flour, cocoa powder, baking powder, baking soda, and salt into a large mixing bowl.

   Time: PT5M

2. Cream Butter and Sugar

   In a separate bowl, beat the softened butter with the granulated sugar until light and fluffy, about 3‑4 minutes.

   Time: PT5M

3. Add Eggs and Vanilla

   Add the eggs one at a time, beating well after each addition, then stir in the vanilla extract.

   Time: PT5M

4. Combine Wet and Dry, Add Chocolate

   Gradually add the dry mixture to the butter‑egg mixture, alternating with the milk, mixing just until combined. Fold in the melted dark chocolate until the batter is smooth.

   Time: PT5M

5. Divide Batter into Pans

   Evenly divide the batter among four 8‑inch cake pans, smoothing the tops with a spatula.

   Time: PT5M

6. Bake Cake Layers

   Bake in a pre‑heated oven at 350°F for 25‑30 minutes, or until a toothpick inserted in the center comes out clean.

   Time: PT30M

   Temperature: 350°F

7. Cool Cake Layers

   Allow the cakes to cool in the pans for 10 minutes, then turn out onto a wire rack to cool completely.

   Time: PT15M

8. Make Cocoa Paste for Mousse

   In a small bowl, whisk together 2 tbsp hot water and ½ cup cocoa powder until smooth.

   Time: PT5M

9. Melt Chocolate for Mousse

   Melt 8 oz dark chocolate in a microwave or double‑boiler, then stir in the cocoa paste until fully incorporated.

   Time: PT5M

10. Whip Cream to Medium Peaks

    In a chilled bowl, whip 2 cups heavy cream to medium peaks using a hand mixer.

    Time: PT5M

11. Fold Cream into Chocolate

    Gently fold the whipped cream into the melted chocolate mixture until light and airy.

    Time: PT5M

12. Chill Mousse

    Cover the mousse and refrigerate for at least 1 hour until firm enough to spread.

    Time: PT1H

13. Prepare Ganache

    Heat 1 cup heavy cream in a saucepan until just simmering, then pour over 8 oz chopped dark chocolate. Stir until smooth and glossy.

    Time: PT5M

14. Cool Ganache

    Allow the ganache to cool at room temperature for about 20 minutes, stirring occasionally, until it thickens but is still pourable.

    Time: PT20M

15. Assemble the Cake

    Place the first cake layer on a serving plate, spread a generous layer of chilled mousse, repeat with remaining layers, then pour the ganache over the top, letting it drip down the sides. Smooth with an offset spatula.

    Time: PT10M

Nutrition Facts

Calories

350

Protein

5 g

Carbohydrates

35 g

Fat

20 g

Fiber

3 g

Ingredient Substitutions

• Instead of All-Purpose Flour: Gluten‑Free Flour Blend
• Instead of Unsalted Butter: Margarine
• Instead of Granulated Sugar: Coconut Sugar
• Instead of Cocoa Powder: Dutch‑process cocoa
• Instead of Eggs: Egg replacer
• Instead of Vanilla Extract: Vanilla bean paste
• Instead of Milk: Almond milk (for dairy‑free)
• Instead of Dark Chocolate: Semi‑sweet chocolate
• Instead of Dark Chocolate: Semi‑sweet chocolate
• Instead of Heavy Cream: Whipping cream
• Instead of Heavy Cream: Whipping cream
• Instead of Dark Chocolate: Semi‑sweet chocolate

Equipment Needed

• Mixing Bowl
• Whisk
• Hand Mixer or Stand Mixer
• Fine Mesh Sieve
• 8‑Inch Round Cake Pans
• Wire Cooling Rack
• Saucepan
• Spatula
• Measuring Cups and Spoons
• Refrigerator
• Piping Bag or Offset Spatula (optional)
• Oven

Critical Steps — Do Not Skip

• Bake Cake Layers
• Chill Mousse
• Cool Ganache
• Assemble the Cake

Chef Tips from the Video

• Use high‑quality 70% dark chocolate for the best flavor and shine.
• Sift the cocoa powder with the flour to avoid gritty texture.
• Room‑temperature eggs and butter create a smoother batter.
• For an extra glossy ganache, strain it through a fine mesh sieve before pouring.

Troubleshooting

Storage

Refrigerator: Cover tightly; lasts up to 3 days.

Freezer: Wrap each slice in plastic and foil; freeze up to 1 month.

Room temperature: Do not leave at room temperature longer than 2 hours.

Make-Ahead Tips

• Mousse can be prepared a day ahead and kept refrigerated.
• Ganache can be made up to 12 hours ahead; store at room temperature and re‑whisk before use.
• Bake the cake layers up to 2 days ahead; store wrapped in the refrigerator.

Frequently Asked Questions