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Thaw puff pastry for about 45 minutes. Roll out and cut each sheet into 6 squares.
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Preheat the oven to 400 degrees.
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Combine the apples, walnuts, juice, cinnamon, and agave in a bowl.
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Place a heaping spoonful of the apple mixture in the center of each pastry square. Gather the sides and pinch together in a "purse."
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Brush with the melted butter and sprinkle with cinnamon sugar.
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Place on a cookie sheet with cooking spray and bake for about 10 minutes until golden brown.