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Cream together the butter, cream cheese, salt, and sour cream.
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Stir in the flour.
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On a floured surface, kneed the dough with your hands until it's smooth.
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Chill the dough in the refrigerator for three hours.
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Place chilled dough on a lightly floured countertop.
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Using a rolling pin, roll the dough thin (about 1/8").
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With a table knife, cut the dough into 3" squares.
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Spread one corner of each square with the filling mixture.
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Starting in that corner, roll up each square, then curve in the ends to form a crescent.
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Place on cookie sheet and bake at 350 for 15-20 minutes, or until edges are beginning to turn golden.