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1
Preheat oven to 375 degrees.
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2
Remove pie crusts from packaging and squeeze both crusts together.
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3
Roll into a 12-inch long, 3-inch wide, 1/2-inch high rectangle and cut into 6 2-inch pieces.
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4
Roll one piece into a ball, and then roll out into a 5-inch circle on parchment paper.
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5
Place on a parchment paper-lined baking sheet and continue with remaining pie crust dough.
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6
Set aside while you prepare the peaches.
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7
Peel the peaches, slice in half and remove the seeds.
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8
Place peach halves in a bowl, sprinkle with the lemon juice and stir gently.
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9
Sprinkle 2 tablespoons of the sugar, the flour and cinnamon over the peach halves and stir gently to coat all peaches with the dry ingredients.
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10
Set aside.
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11
Place the mascarpone cheese in a bowl and add the remaining 2 tablespoons of sugar.
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12
Spoon 1 heaping tablespoon of the sweetened mascarpone cheese into the hollow of one of the peach halves.
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13
Center the peach half filled-side down on one of the pastry circles.
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14
Brush the dough with the beaten egg white and crimp dough around the peach.
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15
Continue with remaining peaches.
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16
Brush the outside of all 6 crostatas with the remaining egg white and sprinkle the outside crusts with granulated sugar.
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17
Bake for 30 minutes.
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18
Serve immediately, or refrigerate and serve cold.