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Preheat oven to 425 degrees. Grease a loaf pan.
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Combine milk and vinegar and set aside for 10 minutes.
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Mix together ¾ cup of oats, flour, sugar, baking soda, baking powder, and salt.
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In another bowl, stir together the butter, vanilla, milk mixture and Guinness.
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Add dry mixture into the liquid mixture, and stir until blended.
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Pour batter into the prepared pan. Sprinkle top with remaining oats.
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Bake 30 minutes, then reduce temperature to 400 and bake for additional 20 minutes.
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Allow to cool in pan for 30 minutes before moving to a wire rack.