Melt 2 tablespoons of the butter. Then crack the eggs into a blender and add the milk, flour, salt, vanilla, sugar, and melted butter. Mix on a medium speed for 1 minute. You want the batter to be frothy.
Pour the batter into a nonstick skillet, and place in the oven to bake for 20 minutes.
As soon as the Dutch Baby has finished cooking top with the powdered sugar and the remaining butter. Serve each slice with raspberries and a dollop of lemon curd.