Step 1

Preheat the oven to 350°F.

Step 2

In a medium bowl combine the flour, sugar, baking powder, salt, and 2 tablespoons of cocoa powder. Stir in the milk and vanilla.

Step 3

Spread the batter evenly in an ungreased 9-inch square pan.

Step 4

Combine the remaining 4 tablespoons of cocoa powder with the brown sugar and hot water. Carefully pour the mixture over the batter. DO NOT stir the mixture into the batter.

Step 5

Bake for 35 to 40 minutes. Serve warm with ice cream, if desired.