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Melt the remaining 2 tablespoons of butter and brown sugar in a small skillet over medium heat. Add the pecan pieces and stir to coat. Continue stirring over the heat until the pecans have caramelized. Remove from heat and set aside. Let cool completely.
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Place the pumpkin pieces, caramelized pecans, and butterscotch chips in a bowl.
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In a small separate bowl, whisk together the sugar, semolina, and remaining tablespoon of ground cinnamon.
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Add the creme fraiche and the teaspoon of vanilla extract to the bowl with the pumpkin and caramelized pecans and toss to coat evenly.
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Sprinkle the dry ingredients mixture over the top and toss again to combine.
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Preheat the oven to 350 degrees F.
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Line a baking sheet with parchment paper.
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Remove the dough from the fridge and roll out on a lightly floured surface into a large rectangle.
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Spread the filling out on top of the dough, leaving a 1-inch frame on all sides.
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From the long side, roll the dough into a long loaf and tightly press the ends to seal them.
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Transfer the strudel onto the prepared baking sheet, seam side down. Place on the middle rack of the oven.
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Bake for 40 minutes.
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Remove from the oven, let cool, and transfer to a wire rack. Place the wire rack on top of the baking sheet lined with parchment paper the strudel has been baked on.