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Begin heating up your waffle iron.
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In a large bowl, combine all purpose flour, baking soda, sugar, and salt. Whisk to combine.
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Create a well in the middle of the flour.
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In the center of the well, add buttermilk, egg, butter, and vanilla.
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Mix all ingredients in the bowl together until smooth.
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In a separate bowl, beat egg whites until stiff.
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Gently fold egg whites into batter.
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Spray hot waffle iron with non stick cooking spray.
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Carefully pour ½-¾ cup batter into waffle iron.
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Cook until brown, about 4-5 minutes each, depending on your waffle iron.
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Serve immediately or freeze and reheat when desired.