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Triple Chocolate Brownie-Mousse Stacks

Updated: Dec 24, 2025 · Helen Carter

When I think of my childhood, I can’t help but remember the afternoons spent in the kitchen with my mom, who was a self-proclaimed chocolate addict. We’d whip up all sorts of desserts, but the highlight was always her Triple Chocolate Brownie-Mousse Stacks. The kitchen would fill with the rich, warm scent of melting chocolate, and I’d sneak spoonfuls of batter when she wasn’t looking. Those moments are the reason I cherish making this recipe for my family today; it’s a sweet reminder of love, laughter, and messy kitchens.

Triple Chocolate Brownie-Mousse Stacks - detail 1

Perfect for birthdays, celebrations, or just a cozy weekend treat, these stacks are a chocolate lover’s dream! Each bite is a layered symphony of fudgy brownies and creamy mousse that everyone, from kids to adults, adores. Whether it’s a family gathering or a dinner party with friends, these Triple Chocolate Brownie-Mousse Stacks are sure to impress and satisfy the sweetest cravings.

Why You’ll Love "Triple Chocolate Brownie-Mousse Stacks"

  • Quick prep time of just 30 minutes, allowing you to whip these up in a flash.
  • Minimal ingredients mean you can make these delightful treats without a trip to the store.
  • Family-friendly and sure to be a hit with both kids and adults alike.
  • Perfect for special occasions or simply to satisfy that chocolate craving.
  • Can be made ahead of time and stored for a delicious dessert later.

Ingredients You’ll Need

  • ¾ cup unsalted butter, cut into pieces
  • 1 bar (4 oz.) bittersweet dark chocolate baking bar, chopped
  • 1 ½ cups sugar
  • 1 teaspoon vanilla extract
  • 4 large eggs
  • 1 cup all-purpose flour
  • ¼ teaspoon baking powder
  • ¼ teaspoon table salt
  • ½ package (12 oz.) milk chocolate morsels, use 1 cup
  • ¼ cup creamy peanut butter (try natural peanut butter for a healthier twist)
  • 1 cup heavy cream (for the milk chocolate mousse)
  • 1 cup white chocolate morsels
  • 1 ¼ cups heavy cream, divided (for the white chocolate mousse, reserve some for folding)

Step-by-Step Instructions

Preheat the Oven

  1. Start by preheating your oven to 350°F (175°C). This step is crucial for achieving those perfectly baked brownies.
  2. While the oven warms up, grab a 9x9-inch baking pan and lightly coat it with cooking spray or line it with parchment paper for easy removal later. Trust me, it’ll save you a headache when it’s time to cut those brownies!

Make the Brownie Batter

  1. In a medium saucepan over low heat, melt the unsalted butter and chopped bittersweet chocolate together. Stir gently until smooth and creamy. Don’t rush it; the chocolate deserves a little love!
  2. Once melted, remove the saucepan from the heat and whisk in the sugar and vanilla extract until well combined. It should look shiny and inviting.
  3. Next, add the eggs one at a time, whisking between each addition. This helps to keep the batter light and fluffy.
  4. Now, sift in the all-purpose flour, baking powder, and salt. Stir until just combined. Don’t worry if it looks a bit thick; that’s what we want for fudgy brownies!
  5. Pour the batter into the prepared baking pan and spread it evenly. Bake for about 25 minutes, or until a toothpick inserted in the center comes out with a few moist crumbs. Let it cool in the pan for 10 minutes before transferring it to a wire rack to cool completely.

Prepare the Milk Chocolate Mousse

  1. In a microwave-safe bowl, melt the milk chocolate morsels in 30-second intervals, stirring each time until smooth. Be careful not to burn it!
  2. Once melted, add the creamy peanut butter and mix until smooth. You’ll love the extra depth this adds.
  3. In another mixing bowl, whip 1 cup of heavy cream until soft peaks form. Gently fold the whipped cream into the chocolate-peanut butter mixture until fully combined. It should be light and airy!

Prepare the White Chocolate Mousse

  1. Just like before, melt the white chocolate morsels in a microwave-safe bowl, again in 30-second intervals, stirring until smooth.
  2. In a separate bowl, whip the remaining 1 ¼ cups of heavy cream until soft peaks form. This is where the magic happens!
  3. Fold the whipped cream into the melted white chocolate until you have a beautifully fluffy mousse. Take your time with this step; gentle folding keeps it light.

Assemble the Stacks

  1. Now comes the fun part! Once the brownies are completely cool, cut them into squares or rectangles as desired.
  2. On a serving plate, place one brownie square and top it with a generous layer of the milk chocolate mousse. Don’t be shy; this is your moment!
  3. Next, add another brownie square on top of the mousse, followed by a layer of the white chocolate mousse. Repeat this process until each stack has at least three layers of brownie and mousse.
  4. Finally, for a touch of elegance, garnish the top of your stacks with some shaved chocolate or a sprinkle of cocoa powder. Your guests will be impressed!

Variations

  • Swap the bittersweet chocolate for dark chocolate for a richer flavor.
  • Add a pinch of espresso powder to the brownie batter for a mocha twist.
  • Use almond butter instead of peanut butter for a different nutty flavor.
  • Make it gluten-free by substituting all-purpose flour with a gluten-free blend.
  • Incorporate seasonal fruits like raspberries or strawberries between layers for a fruity surprise!

Serving and Storage Tips

Serving

These decadent Triple Chocolate Brownie-Mousse Stacks are best served chilled, allowing the mousses to set perfectly. Pair them with a scoop of vanilla ice cream or a dollop of whipped cream for extra indulgence. Feel free to drizzle some chocolate sauce on top for that extra wow factor!

Storage

Store any leftovers in an airtight container in the fridge for up to 3 days. If you want to keep them longer, consider freezing the individual stacks in a freezer-safe container for up to a month. Just let them thaw in the fridge before serving!

Helpful Notes

  • For a richer flavor, use high-quality chocolate brands like Ghirardelli or Callebaut.
  • If you’re dairy-free, try using coconut cream in place of heavy cream for the mousses.
  • Feel free to add crushed nuts between layers for extra texture and flavor.
  • For a lighter version, reduce the sugar in the brownie batter by ¼ cup.
  • These stacks can be assembled a day in advance for an easy dessert option.

Frequently Asked Questions

Can I freeze Triple Chocolate Brownie-Mousse Stacks?

Yes, you can freeze the stacks! Just wrap each individual stack in plastic wrap and place them in a freezer-safe container. They’ll stay fresh for up to a month. When you’re ready to enjoy them, let them thaw in the fridge overnight.

What can I use instead of heavy cream?

If you’re looking for a substitute for heavy cream, you can use coconut cream for a dairy-free option or half-and-half if you want something lighter. Just keep in mind that the texture and richness may vary slightly.

How long do these stacks last in the fridge?

These delicious stacks can be stored in the fridge for up to 3 days in an airtight container. Just make sure they’re well covered to keep them fresh and tasty!

Final Thoughts

So there you have it, my cherished recipe for Triple Chocolate Brownie-Mousse Stacks! I can’t wait for you to try this and watch your family and friends’ faces light up with joy. Remember, it’s not just about the delicious layers of chocolate; it’s about the memories you’ll create while making them. So roll up your sleeves, enjoy the process, and don’t forget to sneak a taste or two! You’re going to do great, and I know these stacks will become a beloved treat in your kitchen, just like they are in mine.

Triple Chocolate Brownie-Mousse Stacks

Triple Chocolate Brownie-Mousse Stacks

Rich and decadent brownie stacks layered with milk and white chocolate mousse.
Print Recipe Pin Recipe
Prep Time 30 minutes mins
Cook Time 25 minutes mins
Total Time 55 minutes mins
Servings: 8 people
Course: Dessert
Cuisine: American
Calories: 350
Ingredients Equipment Method Notes

Ingredients
  

For the Brownies
  • ¾ cup butter unsalted
  • 1 bar bittersweet dark chocolate baking bar 4-oz., chopped
  • 1 ½ cups sugar
  • 1 teaspoon vanilla extract
  • 4 large eggs
  • 1 cup all-purpose flour
  • ¼ teaspoon baking powder
  • ¼ teaspoon table salt
For the Milk Chocolate Mousse
  • ½ package milk chocolate morsels 12-oz. package, use 1 cup
  • ¼ cup creamy peanut butter
  • 1 cup heavy cream
For the White Chocolate Mousse
  • 1 cup white chocolate morsels
  • 1 ¼ cups heavy cream divided

Equipment

  • Oven
  • Mixing bowls
  • Electric mixer
  • Baking pan

Method
 

  1. Preheat the oven and prepare the baking pan with cooking spray.
  2. Melt butter and bittersweet chocolate together.
  3. Mix in sugar and vanilla, then add eggs one at a time.
  4. Add flour, baking powder, and salt, and mix until smooth.
  5. Pour batter into the prepared pan and bake until set.
  6. Prepare milk chocolate mousse by melting morsels and combining with peanut butter and whipped cream.
  7. For white chocolate mousse, melt morsels and fold in whipped cream.
  8. Layer brownies with mousses in stacks and garnish with shaved chocolate.

Notes

You can add more layers or different chocolate types for variation.

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Welcome!

I’m Helen Carter, the heart behind EverythingCuisine.
Here you’ll find simple, comforting recipes made to be enjoyed, shared, and remembered.
Let’s cook something wonderful together 🤍

More about me

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