Preheat oven to 350-degrees.
Mix the flour, cocoa, salt, baking powder, and sugar.
Add the milk and shortening and mix well.
Pour into greased 9" x 9" pan.
In a small bowl mix the brown sugar and cocoa.
Pour over the top.
Pour 2 cups water over the top (do not mix the water in - let it sit on top).
Bake for 40 minutes.
Scoop into a bowl and add some ice cream!