In a small bowl, add milk and gelatin powder. Stir together and set aside.
Add heavy cream and sugar to a medium saucepan and cook on medium heat, stirring together.
Bring mixture to boil. The cream will quickly rise to the top of the pan, so be careful, but as soon as the mixture is boiling, add the gelatin and milk, stirring until dissolved. Cook for one minute making sure to stir constantly.
Remove the saucepan from the heat and stir in vanilla.
Pour into 4 cups (or for smaller servings, 6 ramekins).
Let the cups cool at room temp, then cover and refrigerate for at least 4 hours.
Once panna cotta has chilled, make raspberry sauce. To make sauce, add all ingredients to a blender or food processor and blend until smooth.
Pour the mixture through a sieve to remove the raspberry seeds.
Pour the raspberry sauce over the top and garnish with fresh berries.