In a food processor pulse together flour, salt and granulated sugar. Add butter and pulse mixture until resembles coarse meal (it won't really come together in pieces much at this point, so don't over-process, just pulse until butter is no longer in large pieces).
Add 4 Tbsp water and pulse several times, if it doesn't come together in clumps add remaining 1 Tbsp water. Drop mixture onto a clean surface, gather dough into a ball then divide into two portions. Shape each portion into about a 5-inch disk. Cover each with plastic wrap and chill 1 hour. Meanwhile prepare filling.
To a mixing bowl, add cream cheese, granulated sugar and brown sugar. Using a rubber spatula, stir mixture to blend, while running spatula against bowl to smooth any lumps. Lay pumpkin puree on several layers of paper towels.
Wrap and press to soak some of the excess moisture from pumpkin, until you have 3/4 cup pumpkin puree. Add reduced pumpkin puree to cream cheese mixture along with cinnamon, ginger, nutmeg, allspice and salt and stir. Mix in egg yolk and vanilla extract. Cover bowl and chill until ready to assemble pop tarts.
Arrange 4 of the rectangles, spaced evenly apart on prepared baking sheet. Spread a slightly heaping 1 1/2 tablespoons of pumpkin pie filling evenly down the center of each rectangle, leaving about a 3/4-inch rim on all sides uncoated. Dampen fingertips with water and run along uncoated edges of pop tarts.
Top each with another rectangle, then seal edges with your fingertips, then reseal with a fork (I didn't seal with the fork, I just did a double seal with my fingertips because I wanted them to look more like the real thing). Poke the top center of each tart 3 times with a fork. Cover and transfer to freezer to chill at least 2 hours or up to one week. Repeat process with remaining disk of dough.
Crust recipe adapted from Bon Appetit
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