Chocolate Mousse Cupcake Filling
Equipment
- 2 medium mixing bowls
- 1 Small saucepan
- 1 Whisk
- 1 Rubber spatula
- 1 hand mixer or stand mixer with whisk attachment
- 1 heatproof measuring cup
- 1 Fine mesh strainer optional
- 1 plastic wrap sheet
- 1 piping bag or zip-top bag
Ingredients
- 170 gram dark chocolate 60–70% cocoa; chopped
- 240 milliliter heavy cream cold divided
- 30 gram granulated sugar
- 1 large egg yolk room temperature
- 5 milliliter vanilla extract
- 1 pinch fine sea salt
Instructions
- Chop the dark chocolate into small, even pieces and place in a medium mixing bowl.
- Heat 120 ml of the heavy cream in a small saucepan over medium heat until it just begins to simmer.
- In a separate bowl, whisk the egg yolk, sugar, and salt together until slightly thickened and pale.
- Slowly pour the hot cream into the egg yolk mixture while whisking constantly to temper the yolk.
- Return the mixture to the saucepan and cook over low heat, stirring constantly, until it slightly thickens and coats the back of a spoon.
- Immediately pour the hot custard mixture over the chopped chocolate and let sit undisturbed for 1 minute.
- Whisk the chocolate and custard together until completely smooth and glossy, then whisk in the vanilla extract.
- Press plastic wrap directly onto the surface of the chocolate mixture and let it cool to room temperature, then refrigerate until cold and slightly thickened, about 1–1.5 hours.
- Once chilled, pour the remaining 120 ml cold heavy cream into a clean mixing bowl and whip with a mixer until soft peaks form.
- Gently whisk the chilled chocolate base to loosen it, then fold one-third of the whipped cream into it with a spatula until mostly combined.
- Add the remaining whipped cream and continue folding gently just until no streaks remain and the mousse is light and airy.
- Transfer the mousse to a piping bag or zip-top bag and refrigerate again for at least 30 minutes to firm up before filling cupcakes.
- Core your cooled cupcakes, pipe the mousse into the centers, and serve immediately or chill until ready to serve.
Notes
For best results, use good-quality chocolate since it provides most of the flavor, and avoid overheating the custard or it may curdle—if it looks slightly grainy, you can strain it through a fine-mesh sieve before chilling. Ensure the chocolate base is fully cold before folding in whipped cream, or the mousse can deflate and become runny. Soft peaks in the whipped cream are key for a light texture; overwhipping will make folding difficult and can lead to a heavy mousse. The filled cupcakes taste best after a short chill to set the centers, and they should be kept refrigerated if not serving within 1–2 hours, then brought to room temperature for 10–15 minutes before eating to bring out the chocolate flavor.
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