Wash the strawberries under cold water and pat them dry. Remove the stems and slice the strawberries in half or quarters, depending on size. Set aside.
In a medium bowl, combine the sour cream with the brown sugar until the sugar is fully dissolved.
In a separate bowl, whip the heavy whipping cream until it begins to thicken. Add the granulated sugar and vanilla extract, and continue whipping until soft peaks form.
Gently fold the whipped cream into the sour cream mixture until well combined.
Distribute the strawberries into four serving dishes. Pour the cream mixture on top of the strawberries. Garnish with fresh mint if desired and serve right away.