In large heat-proof bowl set over hot water, melt chocolate with water, stirring until smooth. Remove from heat; let cool slightly. Whisk in egg whites and vanilla. Stir together sugar, flour, baking powder and salt; stir into chocolate batter just until combined. Pour into lightly greased 8-inch square cake pan. Bake in 350°F oven for 20 to 25 minutes or until edges pull away from pan. Let cool on rack; dust with icing sugar.
Instructions
In large heat-proof bowl set over hot water, melt chocolate with water, stirring until smooth. Remove from heat; let cool slightly. Whisk in egg whites and vanilla. Stir together sugar, flour, baking powder and salt; stir into chocolate batter just until combined. Pour into lightly greased 8-inch square cake pan. Bake in 350°F oven for 20 to 25 minutes or until edges pull away from pan. Let cool on rack; dust with icing sugar.
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