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In a large bowl, cream butter and sugar.
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Add eggs one at a time, beating well after each.
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Combine flour, soda and salt.
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Add flour mixture alternately with water.
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Stir in buttermilk and bran flakes.
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Cover bowl and store in refrigerator.
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When ready to bake, preheat oven to 375º.
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Spoon batter into greased or paper-lined muffin cups.
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Bake 20 minutes if batter is room temperature; bake 30 minutes if batter is straight from the refrigerator.
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Batter will keep up to 10 days in the refrigerator.