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1
Line a baking sheet with a silicone mat or parchment paper.
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2
Cut peeled and cored apples into quarters, cut each quarter into 3 wedges, and cut wedges into chunks.
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3
Melt butter in a large skillet over medium heat; let butter brown to a light golden color and until butter smells toasted, about 1 minute. Stir apples into hot butter; sprinkle with salt, white sugar, and brown sugar. Cook and stir apple mixture until apples are softened, about 5 minutes. Mix in cinnamon and water; continue cooking until apples are soft and sticky, 1 to 2 more minutes. Spread apple filling onto a plate to cool.
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4
Preheat oven to 400 degrees F (200 degrees C).
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5
Form a dough piece into a ball, place on a floured work surface, and roll into a circle about 8 inches in diameter. Spoon 1/3 to 1/2 cup apple filling in the center. Fold dough over filling, leaving about 1 inch of dough on the bottom side visible below the top side. Gently press dough closed around filling, using your fingertips.
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6
Fold the overhanging bottom part of the dough up over the top edge, working your way around the crust, and pinch the overhang tightly to the top part of the crust.
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7
Crimp the edge tightly closed, pinching a little bit of dough with the thumb and forefinger of one hand and using your index finger on the other hand to push a small notch into the pinched dough. Continue pinching and notching all the way around until the crust is tightly crimped together. Repeat with remaining dough and filling. Transfer pies onto prepared baking sheet.
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8
Whisk egg with milk in a small bowl until thoroughly combined. Brush top of each hand pie with egg mixture and sprinkle with about 1/4 teaspoon white sugar. Cut 3 small vent holes in the top of each pie.
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9
Bake in the preheated oven until pies are golden brown and filling is bubbling, 25 to 30 minutes. Let cool for at least 15 minutes before serving.
