6 oz. semisweet or bittersweet chocolate chips
1 oz unsweetened chocolate
1/2 cup milk
1 tsp vanilla extract
1 cup heavy cream
1/4 cup confectioner's sugar
Sweetened whipped cream
Combine chocolate and milk in a glass bowl. Microwave for 2 minutes. Stir until well combined. Mix in vanilla. Let the chocolate mixture stand until cool to the touch, but still smooth and liquid.
Beat the heavy cream and sugar in a large bowl with an electric mixer just until stiff peaks form. Fold the cooled chocolate mixture into the whipped cream. Don't worry about differing streaks of color.
Spoon mousse into 6 wine goblets or dessert dishes and chill, covered with plastic wrap. Can be made one day ahead.
Serve with a dollop of sweetened whipped cream.