Soak the gelatin sheets in cold water for 5-10 minutes until softened.
In a saucepan, combine the heavy cream, granulated sugar, and the vanilla bean (split in half lengthwise). Heat over medium heat, stirring occasionally, until the sugar dissolves and the mixture is warm, but not boiling.
Remove the saucepan from the heat. Take out the vanilla bean, scrape the seeds into the cream mixture, and discard the pod.
Squeeze the excess water from the softened gelatin sheets, then whisk them into the hot cream until completely dissolved.
Pour the mixture into glasses or ramekins, and let it cool at room temperature for 20 minutes.
Transfer the glasses to the refrigerator and chill for at least 4 hours, or until the panna cotta is set.
Meanwhile, prepare the blueberry sauce: In a small saucepan, combine the blueberries, powdered sugar, and lemon juice. Cook over medium heat for 5-6 minutes, or until the blueberries soften and the sauce thickens slightly.
Let the blueberry sauce cool completely, then spoon it over the set panna cotta.
Garnish with fresh blueberries and serve chilled.
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