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Preheat oven to 350F degrees.
Grease an 8-inch round pan with nonstick spray.
In a bowl, whisk together the cake mix, club soda and vanilla until well blended.
Scrape batter into the prepared baking pan.
Place in the center of the oven and bake until a thin knife inserted into the center comes out clean, about 25 to 35 minutes.
Remove from the oven and place on a wire rack to cool.
When cool, remove from the pan and spread with a very thin coating of your favorite frosting.