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In a mini-food processor, pulse the oatmeal until the meal is very fine. Turn into a mixing bowl. Stir the buttermilk into the oats and cover with plastic wrap.
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Let the oatmeal steep in the buttermilk for 12 hours (recipe doesn't state, but I refrigerate!).
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Preheat the oven to 350 degrees F. Grease a 9-inch round cake pan with the butter.
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In a mixing bowl, sift the other ingredients together.
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Stir in the steeped oatmeal and mix well. If the mixture is too wet add a little more flour.
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Lightly dust the work surface with some flour. Turn the dough out onto the surface and knead the dough a couple of times to form a soft ball like shape.
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Press the dough into a round about 2 inches thick.
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Using a sharp knife, make a criss-cross cut into the bread.
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Place the bread in the prepared pan. Bake until golden brown, about 25 to 30 minutes.
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Remove from the oven and cool on a wire rack.
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Serve the bread warm with butter.