Chocolate Mousse Cake

by Erin

Chocolate lovers will want to dive head first into this rich chocolate cake layered with fluffy chocolate mousse, and creamy chocolate ganache.

Chocolate Mousse Cake #thespiffycookie #chocolatecake #dessertrecipe

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Chocolate cake by itself is one dessert I can easily turn down. It just doesn’t get my excited.

But after finding a chocolate cake that met my standards, it has become one of my favorite cake bases, especially when paired with peanut butter.

So when my eldest nephew requested a chocolate mousse cake for his high school graduation party dessert, I knew exactly where to start.

Chocolate Mousse Cake #chocolatelover #mousse #layercake

This is actually the second time I’ve made this cake. I thought about taking pictures of it at his party but for some reason I didn’t. I even made him a cookie cake and 2020 cut out sugar cookies, but all I have a brief phone snapshots.

For once I was focusing more on the moment at hand. Imagine that!

Of course that meant that every person who tried it raved about it and asked for the recipe, resulting in me internally kicking myself. So sorry to all that have been waiting months for me to finally publish this recipe!

Chocolate Mousse Cake #choctoberfest #allthechocolate #ganache

This rich chocolate cake is taken to the next level with a layer of fluffy chocolate mousse, and sealed with a creamy layer of chocolate mousse.

The first time I made it I also served it topped with chocolate frosting but decided whipped cream was equally good (and one less thing to make).

Remember to enter the blogger-sponsored giveaway for a KitchenAid stand mixer! Just in time for all your holiday baking. And at the bottom of this post is a link-up for even more chocolate recipes to enjoy.

Chocolate Mousse Cake Up Close #headfirst #dessertlover #chocoholic

One year ago: Chocolate Hazelnut & Toasted Coconut Cheese Ball

Three years ago: Buckeye Bundt Cake

Four years ago: Rusty Bucket Restaurant

Five years ago: Fall Harvest Salad with Cranberry Vinaigrette

Six years ago: Apple Pie Cookies

Seven years ago: Pumpkin Spice Brownies

Nine years ago: Peanut Butter Hot Chocolate with Oreo Crumbs

Chocolate Mousse Cake #thespiffycookie #chocolatecake #dessertrecipe


Yield: 8-12 servings Prep Time: Cooking Time:
Nutrition facts: 200 calories 20 grams fat



  • 1 oz. (2 Tbsp + 2 tsp) semisweet chocolate, chopped
  • 1/4 cup cocoa powder
  • 1/2 cup hot milk
  • 1 cup all-purpose flour
  • 1 cup sugar
  • 1 tsp baking powder
  • 3/4 tsp baking soda
  • 1/2 tsp salt
  • 3 Tbsp vegetable oil
  • 1 egg, room temperature
  • 1 tsp vanilla extract
  • 1/4 cup boiling water


  • 3/4 tsp gelatin powder
  • 1/2 Tbsp water
  • 3 oz. (1/2 cup) semisweet chocolate, coarsely chopped
  • 2 Tbsp sugar
  • 1-1/2 cups cold heavy cream


  • 1/4 cup + 2 Tbsp heavy cream
  • 1/2 Tbsp unsalted butter
  • 4.5 oz. (2/3 cup) semisweet chocolate, coarsely chopped


  1. For the cake: Preheat oven to 350 degrees. Lightly coat a 9-inch springform pan with nonstick spray or butter and lightly flour. Set aside.
  2. Place the chopped chocolate and cocoa powder in a medium bowl. Pour the hot milk over the mixture and whisk until smooth. Refrigerate mixture for 20 minutes.
  3. In a large bowl, whisk together the flour, sugar, baking powder, baking soda, and salt. Using a hand or stand mixer on medium speed, add cooled chocolate mixture, vegetable oil, eggs, and vanilla. Mix together until well combined. Reduce speed and carefully add boiling water to the cake batter. Beat on high speed for about 1 minute to add air to the batter.
  4. Spread cake batter evenly in the prepared cake pan. Bake for 30-35 minutes, or until a toothpick or cake tester inserted in the center comes out clean.
  5. Remove from the oven and allow to cool completely on wire rack.
  6. For the mousse: Place water in a small bowl, sprinkle the gelatin over water, and let stand for 5 minutes.
  7. Place chocolate and sugar in a medium bowl. Heat 1/2 cup of the cream in the microwave for 1 minute or just until it starts to boil. Add the softened gelatin to the cream and stir until fully dissolved. Pour the cream over the chocolate and whisk until chocolate is melted and the mixture is smooth. Cool to room temperature.
  8. In the bowl of a stand mixer fitted with the whisk attachment, whip the remaining 1 cup cream until soft peaks form.  Use a whisk to mix in 1/3 of the whipped cream into the chocolate mixture. Using a rubber spatula, fold the remaining whipped cream into the chocolate mixture until no streaks appear.
  9. Spoon the chocolate mousse into the pan over the cooled chocolate cake. Smooth the top with an offset spatula. Place the cake to the refrigerator and chill until set, about 2 hours.
  10. For the ganache: Place chocolate in a medium bowl. Heat the cream and butter in the microwave for 1 minute or just until it starts to boil. Pour the hot cream over the chocolate. Stir until chocolate is melted and smooth. Cool to room temperature.
  11. Spread the ganache over the top of the chilled mousse layer and refrigerate until set. About 45 minutes.
  12. Run a knife along the outer edge of the cake to loosen it from the pan and gently remove from the pan. Serve with whipped cream and extra chocolate chips.
Did You Make This Recipe?
I want to see! Tag me on Instagram at @TheSpiffyCookie and hashtag it #TheSpiffyCookie.

Source: Adapted from my Dark Chocolate Peanut Butter Cup Cake and Baked by an Introvert.

Did you make this recipe? I want to see!
Tag @THESPIFFYCOOKIE on Instagram and hashtag it #THESPIFFYCOOKIE

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Amy (Savory Moments) November 2, 2020 - 8:15 pm

This looks so decadent and utterly delicious!!

Malini October 19, 2020 - 7:12 am

Yum. This looks really good. Also I love that you use oil in the cake – I’ve realized that I like oil in cake more than I like butter. Can’t wait to try it!

Erin October 19, 2020 - 3:45 pm

Yea, they come out with a much better texture with oil!

Wendy Klik October 15, 2020 - 9:37 am

That is a gorgeous looking cake!!

Karen October 14, 2020 - 5:19 pm

That’s a gorgeous cake! What a nice auntie!


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