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Preheat the oven to 400°F and place your rack in the middle of the oven.
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Line a baking sheet with parchment paper or a silpat. On the baking sheet, unfold the puff pastry into a rectangle. Spread the goat cheese cheese evenly onto the dough, making sure to leave a one inch border all around. Season with salt and freshly cracked pepper.
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Arrange the sliced apples over the goat cheese. Fold the edges of dough over to form a crust and pinch at the edges. Brush the egg yolk over the crust edges.
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Bake the tart for 35 minutes. Meanwhile, add maple syrup to a small pan or pot. Once it becomes more liquid in texture, add in your chopped walnuts and stir until the mixture starts to harden. Transfer onto a piece of parchment paper and let cool.
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Remove the tart from the oven and let cool for 2-3 minutes. Chop the candied walnuts up into smaller pieces. Top the tart with the chopped candied walnuts and prosciutto. Slice and enjoy immediately!