Preheat oven to 325°F (160°C). Place chocolate chips in a heatproof bowl. In a saucepan, bring cream and milk just to a boil; pour over chocolate and stir until melted.
In a separate large bowl, whisk egg yolks with sugar until smooth. Whisk one-third of the chocolate mixture into egg yolk mixture. Stir in remaining chocolate mixture, hazelnut liqueur and vanilla until smooth. Pour into six 6-oz (175 mL) custard cups or ramekins; place ramekins in 13 x 9-inch (3 L) baking dish. Pour in enough boiling water to come halfway up sides of the ramekins.
Bake in centre of oven until set around edge, but still slightly wiggly in centre, about 20 min. Remove ramekins to wire rack; cool to room temperature. Cover and refrigerate until chilled.
Garnish each ramekin with a sprinkle of hazelnuts and a few fresh raspberries.
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