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1
Weigh or lightly spoon flours and cornstarch into dry measuring cups; level with a knife. Sift together flours, cornstarch, granulated sugar, xanthan gum, and salt in a medium bowl.
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2
Place cream cheese, softened butter, milk, and egg in a food processor; process until blended. Add flour mixture; process until blended and dough pulls away from sides. Shape dough into a ball; wrap in plastic wrap. Chill 1 hour.
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3
Preheat oven to 375u00b0.
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4
Combine apple and next 6 ingredients (through cinnamon), tossing to coat apple.
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5
Place dough on a baking sheet lined with parchment paper and lightly floured. Cover with an additional sheet of parchment paper. Roll dough into a 13-inch circle; remove top layer of parchment paper. Spoon apple mixture onto half of circle, leaving a 1-inch border around outside edges.
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6
Fold dough over filling; press edges together with a fork to seal. Brush top of dough with melted butter; sprinkle with turbinado sugar.
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7
Cut three diagonal slits into top of strudel using a sharp knife. Bake at 375u00b0 for 40 minutes or until golden brown. Cool completely on pan. Sprinkle with powdered sugar before serving.