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In a mixing bowl, combine flour, baking powder, 1 teaspoon cinnamon, and salt.
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In another bowl, beat together eggs, 2/3 cup sugar, and vanilla until thick and lemon colored.
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In another bowl, combine cream and butter.
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Alternately add dry ingredients and cream mixture to egg mixture.
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Beat each time until just blended.
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Chill dough for 2 hours.
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Roll out dough 3/8-inch thick on a powdered sugar or floured surface.
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Cut with doughnut cutter.
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Fry in 375° oil turning once; allow about 1 minute per side.
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Drain on paper towels.
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Shake warm doughnuts in a small brown paper bag with remaining sugar and cinnamon.