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About two hours before serving, process cream cheese, flour and ½ cup of butter in a food processor till smooth.
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Shape into a ball, wrap and refrigerate for at least one hour.
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In skillet over medium heat, cook mushrooms and onions in 3 tbsp butter till tender.
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Add salt, basil and flour, stir together, add sour cream. Stir until thickened. Set aside.
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On a floured surface with a floured rolling pin, roll half of dough 1/8-inch thick.
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With floured 2½-inch round cookie cutter, cut out as many circles as possible.
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Repeat with other half of dough.
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Preheat oven to 450°F.
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Onto one-half of each dough circle, place a tsp of mushroom mixture.
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Brush edges of circle with some egg; fold dough over filling.
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With fork, firmly press edges together to seal; prick tops.
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Place turnovers on un-greased cookie sheet; brush with remaining egg.
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Bake 12 to 15 minutes till golden. Serve warm.