Preheat oven to 350 degrees. Grease 8-inch square baking pan. Combine flour, cocoa and salt in small bowl. Beat butter, granulated sugar and brown sugar in large bowl until creamy. Add 2 eggs, one at a time, beating well after each addition. Add vanilla extract; mix well. Gradually beat in flour mixture. Reserve 3/4 cup batter. Spread remaining batter into prepared baking pan.
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