Preheat oven to 350.
Combine 3/4 cup sugar, flour, 3 tablespoons cocoa, baking powder, and salt. Blend in milk, butter, and vanilla. Beat until smooth.
Pour batter in 9 x 9 inch pan.
Combine sugar, brown sugar, 4 tablespoons cocoa. Sprinkle over batter. Pour hot water on top.
Bake 40 minutes. Let stand 15 minutes before serving.
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