Triple Chocolate Mousse Cake

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This Triple Chocolate Mousse Cake is an amazing combination of chocolate cake, chocolate fudge, and chocolate and white chocolate mousse! Smooth and creamy layers of mousse on top of a rich, moist cake. It’s so freaking good!

Triple Chocolate Mousse Cake recipe

Triple Chocolate Mousse Cake Recipe

So today is my 4 year blogiversary. If that term is unfamiliar, basically today marks 4 years of blogging. 🙂 It’s hard to believe it’s been that long and yet hard to believe it hasn’t been longer. When I look back at the blog when it started to where it is now, so much has changed and there have been so many wonderful experiences. So today I celebrate by bringing you this wonderful cake!

Before we dive into the cake, I have to tell you that the hubs and I had a pretty fun weekend. Saturday in particular. We live just north of Atlanta so it actually puts us fairly close to the mountains in North Georgia. The hubs has been wanted to go up to the mountains and go hiking for some time now and finally this week I was all, “Let’s go hang out in nature and go hiking!”

Of course the hubs was all, “Yea babe, great idea!” and totally let me think I was the brilliant one. Smart man. 🙂

Then came Friday night and we had to set our alarms to get up early. 🙁 We wanted to take Jessie with us so we decided to try and get up to the mountains early so it’d be a little cooler for her. With all her fur, she gets pretty hot.

My alarm went off and it was still dark out and I was not too happy. I hit snooze – obviously.

Favorite Triple Chocolate Mousse Cake recipe
Homemade Triple Chocolate Mousse Cake

Then the alarm went off again. I turned it off and the next thing I know the hubs sits down right next to me with a hot cup of coffee. He is just about bouncing off the walls. I can just feel his excitement – and it’s met with a nice groan. 🙂 Lindsay was sleepy.

And if you know the hubs wells, then you know he is NEVER awake before me. Certainly never out of bed before me.

But as soon as I got up, he told me he’d been awake for about an hour just counting down the minutes until he heard my alarm go off. He was actually sitting on the stairs outside the door with the coffee. He waited for one snooze and then couldn’t take it anymore.

I mean, it’s hard to not get up and get going when you hear that. Adorbs, you guys. The excitement.

And we really did have fun. It was a little cloudy at first, then got sunny which worked out really nicely for Jessie. She was worn out by the end, but she handled it like a champ. I know she’s a dog and all and that should totally be her thing, but she’s actually totally into being indoors and napping so it was a big morning for her. 🙂

Needless to say, we all napped when we got home. Ha! We totally won at life that day.

Best Triple Chocolate Mousse Cake
Best Homemade Triple Chocolate Mousse Cake recipe

I was also totally winning at life when I made this cake a few weeks ago. It’s hard to resist all the chocolate! Dark chocolate in the cake, semi sweet in the chocolate mousse and then white chocolate on top. Pure heaven and the ultimate cure for a serious chocolate craving.

The bottom layer is a dark chocolate cake. It’s relatively dense, which I love with the mousse. It creates a nice contrast to the light, smooth mousse.

How to Assemble Your Triple Chocolate Mousse Cake

Once the cake is baked and cooled, it’s time to build the rest of the cake. I used a plastic cake collar to build it, but you could also build it in your cake pan (see this photo of a lined cake pan). I’d recommend an 8×3 inch pan so that the sides are higher, but an 8×2 would work as well. To build it in your pan, you’ll basically build your own cake collar with parchment paper. The pan helps keep the parchment paper standing up. I typically put a cake circle in the bottom of the pan and clear wrap underneath it to lift the cake out when it’s ready, but if you have an 8 inch springform pan, that wouldn’t be necessary since you can just remove the sides.

The cake is built in a few parts so that the layers can firm up before adding the next. The fudge layer is added to the top of the cake first, then allowed to firm a bit. Next is the chocolate mousse, followed by a little wait time, then the white chocolate mousse. Once the whole cake is firm, you’re ready to go! I topped the cake with some chocolate curls and a little sprinkle of cocoa powder, but you could also try piping some whipped cream around the outer edge or even just sprinkle with cocoa or some chocolate sprinkles. You do you. 🙂

I sure do hope you give the cake a try. Not only is it delicious, but it’s a celebration! Four years of blogging – here’s to another 4!

Easy Triple Chocolate Mousse Cake
Triple Chocolate Mousse Cake on stand

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Triple Chocolate Mousse Cake on cake stand

Triple Chocolate Mousse Cake

  • Author: Lindsay
  • Prep Time: 30 minutes
  • Cook Time: 20 minutes
  • Total Time: 50 minutes
  • Yield: 12-14 Slices
  • Category: Dessert
  • Method: Oven
  • Cuisine: American


This Triple Chocolate Mousse Cake is an amazing combination of chocolate cake, chocolate fudge, and chocolate and white chocolate mousse! Smooth and creamy layers of mousse on top of a rich, moist cake. It’s so freaking good!



  • 1/4 cup (56g) unsalted butter, room temperature
  • 1/2 cup (104g) sugar
  • 1/4 cup (58g) sour cream, room temperature
  • 1/2 tsp vanilla extract
  • 2 egg whites, room temperature
  • 1/2 cup + 2 tbsp (81g) all purpose flour
  • 1/4 cup + 2 tbsp (43g) Hershey’s special dark cocoa
  • 1 1/8 tsp baking powder
  • 1/4 tsp salt
  • 1/4 cup (60ml) milk, room temperature
  • 2 tbsp water, room temperature


  • 6 oz (170g) semi sweet chocolate chips
  • 2 tbsp (30ml) light corn syrup
  • 1/2 tsp vanilla extract
  • 1/2 cup (120ml) heavy whipping cream


  • 4 large egg yolks
  • 1/4 cup (52g) sugar
  • 1 3/4 cups (420ml) heavy whipping cream, divided
  • 8 oz (227g) semi sweet chocolate chips
  • 3/4 cup (86g) powdered sugar


  • 1 1/4 tsp unflavored powdered gelatin
  • 1 1/2 tbsp (23ml) water
  • 9 ounces (255g) white chocolate chips
  • 1 3/4 cups (420ml) heavy whipping cream, cold, divided
  • 1/3 cup (38g) powdered sugar



1. Preheat oven to 350°F (176°C) and prepare an 8 inch cake pan with parchment paper in the bottom and grease the sides.
2. In a large mixing bowl, cream the butter and sugar together until light in color and fluffy, about 3-4 minutes. Do not skimp on the amount of creaming time.
3. Add sour cream and vanilla extract mix until well combined.
4. Add egg whites one at a time, mixing until well combined after each. Scrape down the sides of the bowl as needed to be sure all ingredients are well incorporated.
5. Combine dry ingredients in a separate bowl, then combine milk and water in a small measuring cup.
6. Add half of the dry ingredients to the batter and mix until well combined. Add the milk mixture and mix until well combined. Add remaining dry ingredients and mix until well combined.
7. Spread the batter evenly into the prepared pan and bake for 19-21 minutes, or until a toothpick inserted in the middle comes out with a few crumbs.
8. Remove cakes from oven and allow to cool for 3-4 minutes, then remove to cooling rack to cool completely.
9. One the cake is cooled, prepare the cake pan for layering. To set up your cake pan, line an 8×3 inch springform pan with parchment paper that goes about 2 inches above the top edge of the pan. A springform pan is best so that you can easily remove the cake once it’s been assembled. If you only have a regular 8×3 inch cake pan, line the cake pan with plastic wrap (which can later be used to lift your cake out of the pan once it’s assembled), then add the parchment paper. You can also place a cardboard cake circle in the bottom of the pan, on top of the clear wrap. In lou of using a cake pan to build the cake, you could also use cake collars.
10. Cut the dome off of the cake, then place it in your pan or cake collar.
11. To make the fudge layer, add the chocolate chips, corn syrup and vanilla extract to a medium heat-proof bowl.
12. Heat the heavy whipping cream until it just starts to boil, then pour it over the chocolate chips. Cover the bowl with clear wrap and allow to sit for 3-5 minutes, then whisk until smooth.
13. Pour the chocolate on top of the cake and spread into an even layer. Place the cake in the fridge while the ganache firms, about 1 hour.


1. Combine egg yolks, sugar and 1/2 cup (120ml) of heavy whipping cream in the top of a double boiler. If you don’t have a double boiler, you can use a mixing bowl set over a pot with simmering water in it. I use my mixer bowl. Do not let the water boil, or it will be too hot. To ensure that the steam cooking the eggs doesn’t get too hot, occasionally lift the bowl to release the steam.
2. Cook mixture, whisking constantly. The mixture will thin out at first, then begin to thicken. The egg mixture will be ready when is has thickened, lightened in color and has more volume. It should take about 7-10 minutes and reach 160°F (71°C). Do not boil. When done, remove egg mixture from heat and set aside.
3. Place the chocolate chips for mousse in a medium sized bowl and melt in the microwave in intervals of about 10-15 seconds, stirring well between each interval, until smooth. You could also melt them in a double boiler, if you prefer.
4. Vigorously whisk the egg mixture into the melted chocolate until smooth. Set aside to cool to about room temperature.
5. In another bowl, whip remaining 1 1/4 cups (300ml) of heavy whipping cream and powdered sugar until stiff peaks form.
6. Fold about a ¼ cup of the whipped cream into the chocolate mixture until , then fold about a 1/4 of the chocolate mixture into the whipped cream. Slowly fold the remaining chocolate mixture into the whipped cream.
7. Spread the chocolate mousse into an even layer on top of the chocolate fudge. Refrigerate for about an hour.


1. In a small bowl, sprinkle the powdered gelatin over the water, making sure the powder is all touching water. Let stand for about 5 minutes.
2. Place the white chocolate chips in a medium glass bowl. Microwave 1/2 cup (120ml) of heavy cream in a medium measuring cup until it comes to a boil.
3. Add the gelatin mixture to the hot heavy cream mixture and whisk until the gelatin is dissolved.
4. Pour the hot cream over the white chocolate chips and let stand, covered, for 3-5 minutes. Whisk the white chocolate mixture until the chocolate is melted and the mixture is smooth. If it doesn’t completely melt, microwave in 10-15 second intervals, whisking well between each, until smooth. Set aside to cool to about room temperature.
5. Whip remaining 1 1/4 cups (300ml) heavy cream and powdered sugar at high speed with a mixer until stiff peaks form.
6. Gently fold about a third of the cooled white chocolate mixture into the whipped cream until combined. Add the second third of the cooled white chocolate and gently fold into the whipped cream. Add the remaining white chocolate and fold together until completely combined.
7. Spread the white chocolate mousse into an even layer on top of the chocolate mousse. Refrigerate until completely firm, at least 3-4 hours.


1. Once firm, remove the cake from the pan or remove the cake collar from the sides. If needed, smooth the sides of the cake using an offset spatula, and place cake on a serving plate.
2. Finish off the cake with chocolate curls and a sprinkle of cocoa powder. Keep cake refrigerated until ready to serve.


  • Serving Size: 1 Slice
  • Calories: 642
  • Sugar: 50.3 g
  • Sodium: 94.9 mg
  • Fat: 44.4 g
  • Carbohydrates: 59.2 g
  • Protein: 8.2 g
  • Cholesterol: 144.2 mg

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Triple Chocolate Mousse Cake - a layer of dense chocolate cake, chocolate fudge, chocolate mousse and white chocolate mousse! Delicious!
About Lindsay

I'm a wife and a mom to twin boys and a baby girl! And I've got a serious sweets addiction! Bring on the treats!

Scripture I’m Loving

“Come to me, all you who are weary and burdened, and I will give you rest. Take my yoke upon you and learn from me, for I am gentle and humble in heart, and you will find rest for your souls.” Matthew 11:28-29