Break the dark chocolate into pieces and place in a heatproof bowl.
Heat the heavy cream in a saucepan until it just reaches a simmer. Pour the hot cream over the chocolate.
Add the butter and vanilla extract. Stir until the chocolate is completely melted and the mixture is smooth.
Refrigerate the mixture for at least 2 hours, or until firm enough to handle.
Scoop out small portions of the chilled mixture and roll them into balls. Coat the balls in cocoa powder.
Before serving, chill the truffles in the refrigerator for another hour to allow them to firm up completely.
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