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Set the over at 375 degrees.
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Butter a 12-cup muffin tin and set aside.
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In a large bowl, whisk the flour, sugar, baking powder, and salt just to blend them.
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In another bowl, whisk together the egg, oil, buttermilk, and sour cream.
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Add the buttermilk mixture to the flour mixture.
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With a wooden spoon, stir until the mixture is combined.
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Spoon the batter into the muffin tins, filling each right up to the top.
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Bake the muffins for 20 minutes or until they are firm and golden and a skewer inserted into the center comes out clean.
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Let the muffins cool in the tin for 5 minutes.
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To make the coating:.
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In a small saucepan melt the butter.
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In a large shallow bowl, combine the sugar and cinnamon.
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Stir well.
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While the muffins are still hot, turn them out of the tin.
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Brush each muffin with melted butter.
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Roll in the cinnamon-sugar mixture.