Preheat an oven to 350 degrees F (175 degrees C). Grease a 9×13 inch baking dish.
Mix flour, sugar, baking soda, vanilla extract, cocoa powder, creamy salad dressing, and water in a large bowl. Pour into the greased baking dish.
Bake in the preheated oven until a toothpick inserted into the center comes out clean, about 30 minutes. Cool in the pans for 10 minutes before removing to cool completely on a wire rack.
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