Pre-heat oven to 350°F (180°C) In a 8x8 inch square cake pan, stir together flour, white sugar, 1/4 cup cocoa, baking powder and salt. Add milk and oil and mix well.Sprinkle on top first brown sugar, then cocoa (remaining 1/4 cup), then chocolate chips.In a medium bowl add vanilla to the hot water and 1. Pour directly over mixture without stirring (this gives it more pudding) OR 2. Stir the mixture and then pour the hot water over.Do not stir the hot water into the mixture, it must sit on top.Bake for approximately 30 minutes, just until the sides start to pull away from the pan and the top starts to crack slightly, the middle will be a little jiggly. Enjoy!