berrieswhipped cream and mint for garnish if desired.
Preheat oven to 350 degrees F. Grease a 9 inch square baking dish or round souffle dish. Combine flour, granulated sugar, baking powder, baking soda, salt and 1/3 cup cocoa in medium bowl. Add milk, butter and vanilla, stir until just blended. Spoon the batter into the prepared dish.
Combine brown sugar and remaining 1/4 cup cocoa in small bowl. Sprinkle evenly over batter. Pour boiling water over entire mixture; do not stir.
Bake 35 to 38 minutes, until a toothpick inserted into the top layer comes out clean. Cool at least 10 minutes. Serve in bowls with garnishes if desired.
Make Ahead: The cake can be made a day in advance and served chilled or at room temperature.Little Helpers: The kids can help make the cake batter and sprinkle the brown sugar/cocoa mixture over the top.