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Preheat oven to 350°; spray an 8-inch square metal baking pan with nonstick cooking spray.
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In a large bowl, whisk together flour, sugar, baking soda, and salt.
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Add in milk, oil, and vanilla to the flour mixture and stir until just blended.
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Whisk in vinegar until just blended.
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Immediately pour batter into pan.
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Bake for 25-30 minutes or until a pick comes out clean.
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Let cool completely in pan on a wire rack.
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Can eat as is, or dust with powdered sugar or top with frosting.