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Preheat the oven to 350°F Spray a 9-inch square baking pan with vegetable spray.
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Make cake: in small microwavable bowl, combine the chocolate chips and water. Cook on high for 30 seconds or just until the chips beging to melt. Stir the mixture until it is smooth.
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In a large bowl and using a whisk or electrical mixer, beat sugar, cocoa, egg, egg whites, sour cream, corn syrup, oil, vanilla and melted cholate.
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In another bowl, stir together the flour and baking powder. With a wooden spoon, stir the dry ingredients into the sour cream mixture just until everything is combined. Pour the mixture into a prepared pan.
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Place the pan in the centre of the oven and bake for 30 to 35 minutes or until a tester comes out dry.
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Let the pan cool on a wire rack.
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Make icing: in a bowl and using a whisk or electric mixer, beat icing sugar, cocoa and water until the mixture is smooth. Spread it over the cake.