Brown Butter Salted Caramel Mousse

Name: Brown Butter Salted Caramel Mousse
Prep time: 25 min
Cook time: 8 min
Total time: 33 min
Yield: 6 servings
Cuisine: French
Ingredients: 5 tablespoons (71 g) unsalted butter, cut into 1-tablespoon pieces; 4 oz (113 g) dark chocolate (70% cacao), chopped into small pieces (about ¼ inch); ½ cup (120 ml) heavy cream, cold; ½ cup (100 g) granulated sugar; 2 tablespoons (30 ml) water; 1¼ cups (300 ml) heavy cream, very cold; 1 (30 g) large egg white, at room temperature, pasteurized or from pasteurized eggs; ½ teaspoon (2½ ml) vanilla extract; pinch (½ g) fine sea salt; ½ cup (120 ml) heavy cream, very cold; 1 tablespoon (13 g) granulated sugar; to taste fleur de sel or other finishing sea salt

From the MyKitchenBank Kitchen

A silky, decadent mousse that layers dark chocolate ganache with brown butter caramel, topped with airy whipped cream and a whisper of sea salt. The brown butter adds depth and nuttiness, while the caramel contributes gentle sweetness and the dark chocolate provides richness. No baking required—just careful technique and proper chilling.

Prep: 25 min
Cook: 8 min
Wait: 2 hr 15 min
Total: 2 hr 48 min
Makes: 6 individual servings in 6-8 oz glasses or ramekins

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Ingredients

6 servings

For the mousse
5 tablespoons (71 g) unsalted butter, cut into 1-tablespoon pieces
4 oz (113 g) dark chocolate (70% cacao), chopped into small pieces (about ¼ inch)
For the caramel layer
½ cup (120 ml) heavy cream, cold
½ cup (100 g) granulated sugar
2 tablespoons (30 ml) water
For the mousse
1¼ cups (300 ml) heavy cream, very cold
1 (30 g) large egg white, at room temperature, pasteurized or from pasteurized eggs
½ teaspoon (2.5 ml) vanilla extract
pinch (0.5 g) fine sea salt
For serving
½ cup (120 ml) heavy cream, very cold
1 tablespoon (13 g) granulated sugar
to taste fleur de sel or other finishing sea salt

Equipment (10)

Medium heavy-bottomed saucepan
Small heavy-bottomed saucepan
Instant-read thermometer
Microwave-safe bowl or heatproof bowl
Whisk
Electric mixer or hand whisk
Rubber spatula
Wooden spoon
6 small glasses or ramekins (6–8 oz each)
Fine-mesh strainer (optional, for smoothness)

Steps

Before you start

Have all ingredients at the stated temperature before you begin
Chill your mixing bowls and beaters in the freezer for 15 minutes
Measure and chop the chocolate finely so it melts evenly
Have 6 small glasses or 6-8 oz ramekins ready

1
Brown the butter
- In a medium heavy-bottomed saucepan, melt the 5 tablespoons (71 g) butter over medium heat, stirring frequently.
- Continue cooking for 5–7 minutes, swirling the pan occasionally.
- Watch closely: the butter will foam, foam will subside, and solids will begin to turn golden brown.
- You'll smell a rich, toasted, nutty aroma when it's ready.
- The solids should look dark brown (not black) at the bottom.
- Pour the brown butter (including all the solids) into a small bowl to cool slightly, about 5 minutes.
- You should have about 4 tablespoons (60 ml) of brown butter.
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Ready when: Butter is deep golden brown with nutty aroma, solids at bottom are dark brown
Tip: Watch constantly near the end—brown butter can burn quickly. If it starts to smell acrid or turns black, start again.
2
Prepare the chocolate ganache
- Place the 4 oz (113 g) chopped dark chocolate in a microwave-safe or heatproof bowl.
- Gently pour the warm brown butter over the chocolate, letting it sit undisturbed for 30 seconds to begin melting the chocolate.
- Then whisk slowly until smooth and fully combined.
- The residual heat will melt the chocolate completely.
- Add the vanilla extract (0.5 teaspoon / 2.5 ml) and pinch of fine sea salt (0.5 g).
- Whisk until the mixture is silky and glossy.
- Set aside to cool to room temperature, about 10 minutes.
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Ready when: Ganache is smooth, glossy, and no warmer than your finger when touched
Tip: Do not overheat the chocolate; if it seems grainy, add a teaspoon of cold cream and whisk gently.
3
Make the caramel
- In a small heavy-bottomed saucepan, combine the 0.5 cup (100 g) granulated sugar and 2 tablespoons (30 ml) water.
- Stir gently over medium heat until the sugar dissolves completely, about 1–2 minutes.
- Stop stirring once the sugar is dissolved; instead, swirl the pan occasionally to ensure even cooking.
- Watch carefully as the mixture will turn pale amber, then deeper amber.
- When it reaches a deep amber color (about 5–6 minutes total), immediately remove from heat.
- Carefully add the cold 0.5 cup (120 ml) heavy cream—it will bubble and steam.
- Whisk gently to combine.
- Let the caramel cool to room temperature, about 5 minutes.
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Ready when: Caramel is deep amber in color, and after cream is added, mixture is smooth and has cooled
Tip: Use a light-colored pan so you can see the caramel color clearly. Once at deep amber, add cream immediately or it will overcook and become bitter.
4
Whip the cream
- Pour the 1.25 cups (300 ml) very cold heavy cream into a chilled mixing bowl.
- Using an electric mixer on medium-high speed (or a hand whisk if using one), whip the cream until it reaches stiff peaks, about 2–3 minutes with a mixer.
- The cream should hold its shape when the whisk is lifted.
- Set the whipped cream aside in a separate bowl.
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Ready when: Cream forms stiff peaks that hold their shape
Tip: Over-whipping creates grainy texture; stop as soon as you see stiff peaks forming.
5
Whip the egg white
- Using clean beaters (electric mixer on medium-high speed) or a hand whisk, whip the 1 large (30 g) pasteurized egg white in a separate chilled bowl until it reaches stiff peaks, about 2–3 minutes.
- The egg white should be glossy and hold its shape when the whisk is lifted.
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Ready when: Egg white forms stiff, glossy peaks that hold their shape
Tip: Ensure the bowl and beaters are completely free of grease, or the egg white will not whip properly.
6
Fold the mousse base
- In a large bowl, gently fold the cooled chocolate-brown butter mixture into the whipped cream using a rubber spatula.
- Use a folding motion (cutting down the center, scraping along the bottom, and turning the bowl slightly with each fold) to maintain the airiness.
- When nearly combined, fold in the whipped egg white in 2 additions, being careful not to deflate the mixture.
- Stop folding as soon as no white streaks remain.
- The mousse should be light, airy, and evenly colored.
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Ready when: Mousse is uniform in color with no white streaks, light and airy texture
Tip: Do not overfold; gentle folding preserves the airiness that makes the mousse light.
7
Layer into glasses
- Divide half of the mousse (about 3.5 tablespoons or 52 ml per glass) into 6 small glasses or 6–8 oz ramekins, spooning it evenly.
- Top each with about 2 tablespoons (30 ml) of the cooled caramel, then finish with the remaining mousse (another 3.5 tablespoons per glass).
- Use the back of a spoon to gently smooth the top.
- Cover loosely with plastic wrap and refrigerate for at least 2 hours (or up to 8 hours) until set and chilled.
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Ready when: Mousse is set and cold to the touch; spoon does not sink into it
Tip: If you layered too much caramel, it may sink to the bottom—this is fine and still delicious.
8
Prepare the whipped cream topping
- Just before serving, whip the 0.5 cup (120 ml) cold heavy cream in a clean chilled bowl with an electric mixer on medium-high speed (or by hand) until soft peaks form, about 1.5–2 minutes.
- Add the 1 tablespoon (13 g) granulated sugar and whip until stiff peaks form, about 30 seconds more.
- The whipped cream should be sweetened and hold its shape.
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Ready when: Cream forms stiff peaks
Tip: Prepare this topping as close to serving time as possible so it stays fresh and fluffy.
9
Serve
- Remove the mousse glasses from the refrigerator.
- Top each with a generous dollop of sweetened whipped cream (about 2 tablespoons per serving).
- Finish with a small pinch of fleur de sel or other finishing sea salt for a contrast of salty and sweet.
- Serve immediately at the table.
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Tip: The sea salt on top adds a sophisticated finish; use a high-quality salt for the best flavor.

Good to know

Tips

Browning butter requires attention; have a cool, dark bowl ready so you can immediately stop the cooking once it reaches deep amber.
All dairy must be very cold before whipping to achieve maximum volume and stable peaks.
Use pasteurized eggs or pasteurized egg whites to avoid food safety concerns. Some grocery stores sell cartons of pasteurized egg white.
The caramel layer may sink slightly into the mousse during chilling—this is natural and part of the flavor integration.

Make ahead

Assemble the mousse layers (through step 7) up to 8 hours ahead. Keep covered in the refrigerator. Prepare the whipped cream topping and add the sea salt just before serving for the best texture and presentation.

Storage & reheating

Refrigerate the assembled, covered mousse for up to 3 days. Do not freeze (the mousse will separate upon thawing). Keep the whipped cream topping separate if making more than 2 hours ahead; it keeps, covered, for up to 1 day in the refrigerator but is best served fresh.

Substitutions

large egg white → 0.5 tablespoon (7.5 ml) aquafaba (liquid from canned chickpeas), whisked until foamy. Aquafaba can replace the egg white for a vegan mousse, though the texture will be slightly less stable. Whip as directed.
dark chocolate (70% cacao) → 4 oz (113 g) milk chocolate (35–45% cacao) or a mix of 3 oz dark and 1 oz milk chocolate. Milk chocolate will make the mousse sweeter and less intense; adjust to your preference.
fleur de sel or other finishing sea salt → Maldon sea salt or kosher salt. Any coarse finishing salt works; avoid fine table salt, which can taste harsh.
vanilla extract → 0.5 teaspoon vanilla paste or 1 teaspoon vanilla bean extract. Vanilla paste offers a deeper, more intense flavor; adjust quantity to taste.