Bloom the gelatin: Sprinkle gelatin over cold water in a small bowl. Let it sit for 5-10 minutes until it becomes spongy.

Heat the cream mixture: In a saucepan, combine heavy cream, milk, and sugar. Split the vanilla bean and scrape seeds into the mixture (or add vanilla extract). Heat over medium until steaming but not boiling.

Dissolve gelatin: Remove the cream mixture from heat. Add the bloomed gelatin and stir until completely dissolved.

Strain and pour: Strain the mixture through a fine sieve into a jug. Pour into ramekins or glasses. Let cool to room temperature.

Chill: Cover with plastic wrap and refrigerate for at least 4 hours, preferably overnight.

Make berry coulis: Blend berries and powdered sugar until smooth. Strain to remove seeds. Drizzle over set panna cotta before serving.

Serve: To unmold, dip ramekins in hot water for a few seconds, then invert onto plates. Garnish with fresh berries and mint.