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Cream the cream cheese, brown sugar, spices and salt together, in a bowl, until they are light and fluffy, using an electric mixer set on medium speed.
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Add the eggs, one at a time, beating well after each addition. Blend in the pumpkin, milk, and vanilla.
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Pour the mixture into the unbaked pie shell. Bake in a preheated oven at 375 degrees Fahrenheit for 45 to 50 minutes or until a knife inserted halfway between the edge and center comes out clean.
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Cool slightly on a wire rack. While cooling, blend the sour cream and sugar together, then spread over the top of the warm pie.
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Return the pie to the oven and bake an additional 3 to 5 minutes or just until the topping is set.
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Cool on a wire rack. Cover and chill in the refrigerator before serving.