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Preheat oven to 375 degrees Fahrenheit.
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Add the flour, baking soda, baking powder, cornstarch, sugar and salt to a large bowl; mix well.
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Add all of the buttermilk at once; stir until soft dough forms.
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It might be a little lumpy, but don't worry about it at this point.
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Pour contents of bowl out onto the counter.
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Knead for a minute or so until blended.
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Divide dough into two portions.
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Shape each portion into a round loaf with lightly flattened tops.
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Put loaves on large ungreased baking sheet, preferably the nonstick kind.
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Sprinkle some additional flour on top of each loaf and with a sharp knife, cut a cross in two slashes across the top of each loaf.
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Let the loaves sit for 10 minutes.
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Bake for 40 minutes or until golden brown.
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Makes 2 loaves.