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Preheat oven to 450 F. Line two baking sheets with parchment paper. Set aside.
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In a small bowl, mix together ⅓ cup sugar and the ground cinnamon.
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Sprinkle ¼ cup sugar onto a large flat surface. Unroll the puff pastry onto the surface and on top of the sugar.
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Pour ½ of the cinnamon sugar onto the puff pastry.
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Using a rolling pin, roll out the puff pastry until it’s about a 13x13 inch square and the sugar is pressed into both sides of the puff pastry.
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Fold two sides of the square towards the center, until they are halfway to the middle. Fold them again so the two folds meet in the middle of the pastry. Fold one half over the other half, as if closing a book.
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Slice the dough into ⅜-inch slices and place onto the prepared baking sheets, cut side up.
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Repeat with the second sheet of puff pastry.
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Bake for 6 minutes, until the bottoms are golden brown. Then, flip with a spatula and bake for an additional 3-5 minutes, until golden brown on top.
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Transfer to a wire rack to cool completely.