Preheat oven to 350 degrees. Spray a 9 inch round cake pan with vegetable cooking spray. Set aside. In a small bowl, combine buttermilk, applesauce, oil, egg, and vanilla. Mix well. Set aside. In a large bowl, combine flour, sugar, cocoa, and baking soda. Stir to break up lumps. Add buttermilk mixture; whisk until smooth, about 1 minute. Pour batter into prepared pan. Bake until a toothpick inserted in center comes out clean, about 35 minutes. Cool in pan on a wire rack for 20 minutes. Loosen around edges, turn cake out onto rack and cool completely.
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