Oh, chocolate lovers, gather around! If you’ve ever found yourself dreaming of a dessert that’s rich, creamy, and downright decadent, then let me introduce you to my Decadent Chocolate Mousse Cake Recipe. This cake is the epitome of indulgence, with layers of moist chocolate cake and an airy chocolate mousse that melts in your mouth. I remember the first time I made it for a family gathering – the way everyone’s eyes lit up with delight as they took their first bites is something I’ll never forget!

Every slice feels like a little celebration, and trust me, it’s sure to impress your friends and family, whether it’s a simple weeknight treat or the star of a festive occasion. Plus, it’s surprisingly easy to whip up! So grab your mixing bowls and let’s dive into the world of chocolate bliss, because this cake is destined to become a cherished favorite in your home, just like it is in mine!
Ingredients List
Here’s everything you’ll need to create this luscious Decadent Chocolate Mousse Cake that will have everyone begging for seconds!
- 1 box chocolate cake mix (for a 9×13 cake)
- 3 cups heavy cream, divided (you’ll use this for both the ganache and the mousse)
- 1 cup semi-sweet chocolate chips (the star of our mousse!)
- ½ cup powdered sugar (for sweetening the whipped cream)
- 1 teaspoon vanilla extract (a little touch of flavor that makes a big difference)
- ¼ cup cocoa powder (optional, for dusting on top for that extra chocolatey touch)
- Chocolate shavings or curls (optional, because who doesn’t love a little extra flair?)
Make sure you have everything on hand before you start. It makes the process so much smoother and more enjoyable. Happy baking!
How to Prepare the Decadent Chocolate Mousse Cake Recipe
Now, let’s get into the fun part! Making this Decadent Chocolate Mousse Cake is like taking a little journey through chocolate heaven. Follow these steps, and you’ll have a masterpiece that’ll wow everyone!
Baking the Cake
First things first, we need to bake that delicious chocolate cake! Preheat your oven according to the instructions on the cake mix box. Grease and flour a 9×13-inch pan for easy release later. Prepare the cake mix according to the package directions, then pour it into the prepared pan. Pop it in the oven and bake for about 30 minutes or until a toothpick inserted in the center comes out clean. Once it’s done, let it cool completely in the pan. After cooling, carefully slice the cake horizontally into two even layers. This step is crucial for layering in that luscious mousse!
Making the Chocolate Ganache
Next, we’re diving into the rich chocolate ganache! In a small saucepan, heat 1 cup of heavy cream over medium heat until it’s just simmering. Once you see those little bubbles, pour it over the 1 cup of semi-sweet chocolate chips in a bowl. Let it sit for about 2-3 minutes to melt the chocolate. Then, stir it with a spatula until it’s smooth and glossy. Now, let this delightful ganache cool to room temperature while we tackle the whipped cream!
Whipping the Cream
Grab a mixing bowl and add the remaining 2 cups of heavy cream, the ½ cup of powdered sugar, and the teaspoon of vanilla extract. Beat with an electric mixer on medium-high speed until stiff peaks form. This might take a few minutes, but it’s worth every second! You want that cream to be thick and fluffy, ready to cradle the chocolate ganache.
Combining Ingredients for the Mousse
Now comes the magical part! Gently fold the cooled ganache into the whipped cream using a spatula. Be careful not to overmix; you want to maintain that airy texture. Just fold until you see the chocolate and cream are beautifully combined. It should look like a dreamy, silky mousse that’s bursting with rich chocolate flavor!
Assembling the Cake
Time to layer up! Place one of the cake layers on a serving plate. Spread half of that heavenly mousse on top, smoothing it out evenly. Then, carefully add the second layer of cake on top. Spread the remaining mousse over the top and sides, making it look as fancy as you’d like. This is where you can really get creative!
Final Touches and Refrigeration
For those final touches, dust the top with cocoa powder and sprinkle on some chocolate shavings or curls if you’re feeling extra fancy. Now, it’s time to let this beauty chill in the refrigerator for at least 2-4 hours, but if you can wait, overnight is even better! This helps the mousse set perfectly and makes slicing a breeze when you’re ready to serve. Trust me, the wait is absolutely worth it!
Tips for Success
Before you dive into making this Decadent Chocolate Mousse Cake, here are some tried-and-true tips that’ll help you achieve the best results. Trust me, these little nuggets of wisdom can make all the difference!
- Chill Your Tools: For the best whipped cream, chill your mixing bowl and beaters in the fridge for about 15 minutes before use. This helps the cream whip up faster and become fluffier.
- Use Quality Chocolate: The flavor of your mousse relies on the chocolate you use. Go for high-quality semi-sweet chocolate chips for a richer taste!
- Don’t Rush the Cooling: Let your ganache cool to room temperature before folding it into the whipped cream. If it’s too warm, it could melt the cream and ruin that fluffy texture.
- Be Gentle with the Fold: When combining the ganache and whipped cream, use a gentle folding motion to keep that airy quality. You want it to be light and luscious!
- Perfect Slices: For beautiful, clean slices, use a serrated knife dipped in warm water. It’ll glide through the cake without tearing it apart!
Keep these tips in mind, and you’ll be well on your way to creating a show-stopping dessert that’ll have everyone swooning!

Nutritional Information
Alright, let’s talk numbers! Here’s an estimated breakdown of the nutritional values for each slice of this Decadent Chocolate Mousse Cake. Keep in mind that these figures are approximate and can vary based on specific ingredients:
- Calories: 350 kcal
- Fat: 25 g
- Saturated Fat: 15 g
- Trans Fat: 0 g
- Cholesterol: 90 mg
- Sodium: 150 mg
- Carbohydrates: 30 g
- Sugar: 22 g
- Fiber: 2 g
- Protein: 4 g
This cake is definitely a treat, so enjoy it in moderation! Each slice is packed with rich flavors that make it well worth the indulgence. Happy baking!
FAQ Section
Can I make this cake in advance?
Absolutely! You can bake the chocolate cake a day ahead and let it cool completely. Once cooled, slice it and assemble the mousse layers. Just be sure to refrigerate it until you’re ready to serve. It actually tastes even better when allowed to chill overnight!
What can I use instead of heavy cream?
If you can’t use heavy cream, you can substitute it with coconut cream for a dairy-free option or even use whole milk mixed with a bit of melted butter. Just keep in mind that the texture and richness might slightly differ, but it’ll still be delicious!
How do I store leftovers?
To store any leftover Decadent Chocolate Mousse Cake, cover it tightly with plastic wrap or foil and keep it in the refrigerator. It should stay fresh for up to 3 days. Just remember to take it out a little before serving to enjoy the best texture!
Can I use a different cake mix?
Absolutely! Feel free to experiment with different cake mixes, like vanilla or red velvet, for a fun twist. Just keep in mind that the overall flavor will change, but it could lead to some delightful surprises!
What is the best way to cut the cake?
For clean cuts, use a serrated knife and dip it in warm water before slicing. This technique helps the knife glide through the cake smoothly, giving you those beautiful, neat slices that showcase all that delicious mousse!
Why You’ll Love This Recipe
- Rich and Indulgent: This cake is a chocolate lover’s dream, with layers of rich chocolate cake and creamy mousse that satisfy even the most intense cravings.
- Simple to Make: With just a few easy steps, you can whip up this show-stopping dessert without any complicated techniques.
- Impressive Presentation: The gorgeous layers and optional garnishes make this cake a stunning centerpiece for any occasion.
- Perfect for Any Celebration: Whether it’s a birthday, holiday, or just a Tuesday, this cake is sure to impress friends and family alike!
- Make-Ahead Friendly: You can prepare it in advance, allowing the flavors to meld beautifully and making your life a little easier!
For more recipes follow me in page Pinterest.
Decadent Chocolate Mousse Cake Recipe for Sweet Indulgence
- Total Time: 3 hours
- Yield: 12 servings 1x
- Diet: Vegetarian
Description
This Decadent Chocolate Mousse Cake is rich and indulgent, perfect for chocolate lovers.
Ingredients
- 1 box chocolate cake mix (for a 9×13 cake)
- 3 cups heavy cream, divided
- 1 cup semi-sweet chocolate chips
- ½ cup powdered sugar
- 1 teaspoon vanilla extract
- ¼ cup cocoa powder (optional, for garnish)
- Chocolate shavings or curls (optional, for garnish)
Instructions
- Prepare and bake the chocolate cake according to package directions in a 9×13-inch pan. Cool completely, then carefully slice the cake horizontally into two even layers.
- Heat 1 cup heavy cream until just simmering. Pour over chocolate chips, let sit 2–3 minutes, then stir until smooth. Cool to room temperature.
- Beat the remaining 2 cups heavy cream with powdered sugar and vanilla until stiff peaks form.
- Gently fold the cooled ganache into the whipped cream until just combined.
- Place one cake layer on a serving plate. Spread half the mousse on top. Add the second cake layer and spread remaining mousse over the top and sides.
- Dust with cocoa powder and decorate with chocolate shavings if desired. Refrigerate for at least 2–4 hours before serving.
Notes
- Chill overnight for the best texture and clean slices.
- Use a serrated knife dipped in warm water for easier cutting.
- Cake can be made a day ahead and kept refrigerated.
- Prep Time: 30 minutes
- Cook Time: 30 minutes
- Category: Dessert
- Method: Baking
- Cuisine: American
Nutrition
- Serving Size: 1 slice
- Calories: 350 kcal
- Sugar: 22 g
- Sodium: 150 mg
- Fat: 25 g
- Saturated Fat: 15 g
- Unsaturated Fat: 10 g
- Trans Fat: 0 g
- Carbohydrates: 30 g
- Fiber: 2 g
- Protein: 4 g
- Cholesterol: 90 mg
Keywords: Decadent Chocolate Mousse Cake Recipe