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1
Position rack in center of oven and preheat to 400 .
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2
Thaw pie crust 10 min.
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3
Bake crust till pale golden brown, about 12 min.
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4
Transfer to rack and cold.
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5
Reduce oven temperature to 350 .
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6
Blend brown sugar and flour in processor.
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7
Add in egg, yolk and vanilla and process till blended.
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8
Add in buttermilk and melted butter and process just to blend.
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9
Pour mix into cooled crust.
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10
Bake pie till filling puffs and is almost set but center still moves slightly when pan is shaken, about 45 min.
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11
Cold pie on rack to room temperature.
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12
Refrigeratetill cool, at least 2 hrs and up to 1 day.
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13
Cut into wedges and serve.
