Sift together the flour, baking powder, salt, sugar and 2 tablespoons of the cocoa into a medium sized bowl.
Add the milk, melted butter and vanilla and mix until just combined. The batter will be very thick, but don’t worry, this is how is should be! Spread the batter evenly in the bottom of 6 8 ounce ramekins.
In a small bowl, combine the brown sugar and remaining 4 tablespoons of cocoa. Sprinkle the brown sugar mixture evenly over the batter in the baking dish (you’ll sprinkle about 3 tablespoons into each ramekin)
Then pour the boiling water over the top of the contents of the ramekins (1/4 cup each). Do not mix.