Place the goat cheese in the bowl of a food processor. Pulse several times to break up the cheese.
Add 2 tablespoons of cream and process until smooth and creamy, about 15 seconds. If needed, add a bit more cream.
Add chervil, salt, and pepper, scrape down sides of the bowl, and pulse to combine.
Taste and adjust seasonings.
Transfer to a piping bag fitted with a star tip and pipe 1-2 tablespoons of mousse into each cup.
Serve immediately.