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DEFROST the puff pastry, dust with a flour and use your rolling-pin to make them a bit larger. COMBINE sugar and cinnamon in a small bowl and BEAT the egg in the other small bowl.
PEEL the apples and remove the core. PRE-HEAT the oven to 180 degrees Celsius or 350 degrees Fahrenheit. DIVIDE a small layer of bread crumbs in the center of the puff pastry pieces.
PLACE an apple in the center and dust with cinnamon-sugar. COAT the sides of the puff pastry with egg and fold it inwards.
Leave a small opening in the center, this way the steam from the hot apples can be released so the pastry won't get soggy.
COAT the pastry with egg and dust with cinnamon-sugar. BAKE them in the oven for about 20 minutes, or until they're beautiful golden brown. Exact baking time depends on your oven.
The apple are very hot, so let them cool off a bit before serving. But they're best when they are still a little bit warm. Enjoy!