Party Dark Chocolate and Blackberry Mousse Cups

Name: Party Dark Chocolate and Blackberry Mousse Cups
Prep time: 25 min
Total time: 25 min
Yield: 6 servings
Cuisine: French
Ingredients: 5 oz (140 g) dark chocolate, chopped (60–70% cocoa), chopped into small pieces; 1 cup (240 ml) heavy whipping cream, cold, divided (3 tablespoons for melting, remainder for whipping); 1 whole large egg yolk, at room temperature, at room temperature; 1½ tablespoon (12 g) unsweetened Dutch-process cocoa powder, sifted; 2 tablespoon (16 g) powdered sugar, sifted; ½ teaspoon (2½ ml) vanilla extract; ¼ teaspoon (1¼ g) fine sea salt; 6 whole (60 g) crisp wafer cookies (such as Pirouettes or thin butter wafers), broken into coarse crumbs (about ¾ cup / 85 g); 2 tablespoon (30 g) unsalted butter, melted, melted, slightly cooled; 1½ cup (210 g) fresh blackberries, rinsed, patted dry; ½ teaspoon (2 g) unsweetened Dutch-process cocoa powder (for garnish), for dusting (optional)

From the MyKitchenBank Kitchen

Individual no-bake elegance: a crisp cocoa-wafer base anchors silky dark chocolate mousse, crowned with fresh blackberries and a whisper of cocoa. Ready in under an hour, these make-ahead cups shine on any dessert table.

Prep: 25 min
Cook: —
Wait: 35 min
Total: 1 hr
Makes: 6 mousse cups

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Ingredients

6 servings

5 oz (140 g) dark chocolate, chopped (60–70% cocoa), chopped into small pieces
1 cup (240 ml) heavy whipping cream, cold, divided (3 tablespoons for melting, remainder for whipping)
1 whole large egg yolk, at room temperature, at room temperature
1½ tablespoon (12 g) unsweetened Dutch-process cocoa powder, sifted
2 tablespoon (16 g) powdered sugar, sifted
½ teaspoon (2.5 ml) vanilla extract
¼ teaspoon (1.3 g) fine sea salt
6 whole (60 g) crisp wafer cookies (such as Pirouettes or thin butter wafers), broken into coarse crumbs (about ¾ cup / 85 g)
2 tablespoon (30 g) unsalted butter, melted, melted, slightly cooled
1½ cup (210 g) fresh blackberries, rinsed, patted dry
½ teaspoon (2 g) unsweetened Dutch-process cocoa powder (for garnish), for dusting (optional)

Equipment (8)

6 glasses or mousse cups (6 oz / 180 ml each)
Small food processor or blender
Shallow bowl (for melting chocolate)
Microwave or double boiler
Large metal mixing bowl
Electric mixer or whisk
Spoon or spatula
Measuring cups and spoons

Steps

Before you start

Chill six 6-oz (180 ml) glasses or mousse cups in the freezer for 10 minutes
Have heavy cream cold (just taken from the fridge)
Use good-quality dark chocolate (60–70% cocoa)

1
Make cookie base
- In a small food processor or blender, pulse 6 wafer cookies until you have coarse crumbs (about ¾ cup / 85 g).
- Transfer to a small bowl and stir in 2 tablespoons (30 g) melted butter until the mixture resembles damp sand.
- Divide equally among your 6 chilled glasses or mousse cups, pressing gently into the bottom of each with the back of a spoon to form a compact layer about ¼ inch (6 mm) thick.
- Refrigerate while you make the mousse.
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Ready when: Cookie crumb base is compact and level in each cup
Tip: Pulse the cookies briefly—aim for coarse crumbs, not powder, so the base stays crispy.
2
Melt chocolate gently
- Place 5 oz (140 g) chopped dark chocolate and 3 tablespoons (45 ml) cold heavy cream into a shallow microwave-safe bowl.
- Microwave in 20-second bursts, stirring between each, until the chocolate is fully melted and smooth (total time about 40–50 seconds).
- Alternatively, use a double boiler over simmering water, stirring until silky.
- Remove from heat and let cool for 2 minutes.
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Ready when: Chocolate is glossy, smooth, and no longer steaming
Tip: Avoid overheating; burnt chocolate tastes bitter. If chocolate becomes grainy, add a teaspoon of cocoa butter or coconut oil and stir gently.
3
Temper egg yolk
- In a large metal mixing bowl, whisk 1 room-temperature egg yolk with 2 tablespoons (16 g) sifted powdered sugar and 1.5 tablespoons (12 g) sifted cocoa powder until pale and slightly thickened, about 1 minute.
- Add ½ teaspoon (2.5 ml) vanilla extract and ¼ teaspoon (1.25 g) fine sea salt.
- Slowly pour the warm melted chocolate mixture into the egg yolk while whisking constantly to avoid cooking the yolk.
- Whisk until fully combined and glossy.
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Ready when: Mixture is glossy, homogeneous, and light brown
Tip: Whisk the yolk constantly while pouring in the chocolate to emulsify it gently and avoid scrambling the yolk.
4
Whip cream to soft peaks
- In a separate chilled bowl, whip the remaining cold heavy cream (about 14 oz / 210 ml) with an electric mixer on medium-high speed until soft peaks form, about 2–3 minutes.
- The peaks should droop slightly when you lift the whisk.
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Ready when: Cream forms soft, drooping peaks
Tip: Stop before stiff peaks form—overwhipped cream loses its mousse-like texture.
5
Fold cream into chocolate
- Gently fold the whipped cream into the chocolate-egg mixture in two additions.
- Use a large spatula and a folding motion: cut down the center, sweep along the bottom, and fold up and over.
- Rotate the bowl after each fold.
- The mousse should be light, airy, and evenly brown with no white streaks.
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Ready when: Mousse is pale brown, fluffy, and uniform with no visible streaks
Tip: Folding gently keeps the mousse airy; overmixing deflates it and makes it dense.
6
Assemble cups
- Spoon about 3–4 tablespoons (45–60 ml) of mousse into each prepared cup, filling it roughly three-quarters full.
- Top each cup with 4–5 blackberries, pressing them gently into the mousse.
- Refrigerate for at least 25 minutes (or up to 4 hours) so the mousse sets slightly and the flavors meld.
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Ready when: Mousse is cool to the touch and has a slight set to it; berries are nestled into the surface
Tip: Don't refrigerate too long before adding berries—they'll release juice. Add them shortly before serving if the cups will sit overnight.
7
Finish and serve
- Just before serving, dust each cup lightly with ½ teaspoon cocoa powder using a fine sieve.
- Serve chilled, ideally within 10 minutes of garnishing so the cocoa dust stays visible.
- If held longer at room temperature, the mousse will soften slightly.
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Ready when: Cocoa is evenly distributed across the top
Tip: Sift the cocoa powder through a small sieve for a fine, elegant dust—it prevents clumping.

Good to know

Tips

Raw egg concern: If you're uncomfortable with raw or undercooked egg, use pasteurized eggs or a pasteurized egg yolk product. The warm chocolate brings the temperature up slightly, but pasteurized is safest.
Quality chocolate matters: A good dark chocolate with low sugar and high cocoa butter makes a silkier, more luxurious mousse than cheap varieties.
Blackberry tip: Choose firm, dry berries. If berries are very wet, pat them with paper towels before adding to prevent the mousse from becoming soggy.
Make it lighter: For a mousse without egg, whip 1 cup (240 ml) heavy cream to soft peaks, fold in the melted chocolate (without egg), and chill. It will be less rich but still luscious.

Make ahead

You can assemble the cookie base and chill the cups up to 4 hours ahead. Make the mousse no more than 2 hours before serving. Add berries and cocoa garnish within 30 minutes of serving to keep them fresh and bright.

Storage & reheating

Store covered in the refrigerator for up to 3 days (mousse keeps well; berries may release juice after day 2). Do not freeze. Serve chilled. To reheat after refrigeration, let sit at room temperature for 5 minutes, or serve directly from the fridge for a firmer texture.

Substitutions

fresh blackberries → Fresh raspberries or a mix of black and red berries. Raspberries are slightly softer; use immediately before serving to avoid excessive juice.
crisp wafer cookies (such as Pirouettes or thin butter wafers) → Crushed digestive biscuits or shortbread cookies. Use the same weight; digestive biscuits will add a subtly nuttier flavor.
dark chocolate, chopped (60–70% cocoa) → High-quality milk chocolate (50–55% cocoa) or a mix of dark and milk chocolate. Milk chocolate will make the mousse sweeter and less intense; adjust cocoa powder to taste.
large egg yolk, at room temperature → 2 tablespoons (30 ml) pasteurized egg yolk product or omit for a lighter mousse. Omitting the yolk will make the mousse less rich but still delicious; reduce cocoa powder slightly.