To make the crust: Frivolously grease a 9″ pie pan.
Whisk collectively the flour or flour mix, sugar, ClearJel, xanthan gum, and salt.
Lower the chilly butter into pats, then work the pats into the flour combination till it is crumbly, with some bigger, pea-sized chunks of butter remaining.
Whisk the egg and vinegar or lemon juice collectively till very foamy. Combine into the dry substances. Stir till the combination holds collectively, along with 1 to a couple further tablespoons chilly water if obligatory.
Sort correct proper right into a ball and chill for an hour, or as rather a lot as in a single day.
Permit the dough to relaxation at room temperature for 10 to fifteen minutes before rolling.
Roll the crust on a little bit of plastic wrap, on a silicone rolling mat, or in a pie bag that is been intently sprinkled with gluten-free flour or flour mix. Invert the crust into the ready pie pan.
To make the filling: Combine the flour, spices, and salt in a medium-sized mixing bowl.
Add the sugar and pumpkin, mixing totally.
Stir all through the syrup and milk. Permit the combination to relaxation for 30 to 60 minutes at room temperature; or as rather a lot as in a single day all through the fridge, if desired; this enables the flavors to meld, and should make the filling smoother.
Add the crushed eggs, whisking till blended.
Pour the filling into the ready crust. Cowl the sting of the crust with a crust defend, or aluminum foil. (The egg yolk makes this crust susceptible to burned edges, so at all times defend the edges to guard them whereas baking.)
Preheat the oven to 425°F.
Place the pie on the center rack of your oven, and bake it for 20 minutes.
Within the discount of the oven temperature to 350°F, and bake for an additional 30 to 35 minutes, or till the temperature on the middle is a minimal of 175°F, and a knife inserted 1″ from the sting comes out moist, nonetheless clear.
Take away the pie from the oven, and funky to room temperature (or chill) before serving. Serve with whipped cream, if desired.