Pot pies can have a full top and bottom crust or they can be made with a top only. A single top crust is the easiest so that's how I like to make them. The most important part is having a tried-and-true recipe for gluten free pastry.
Measure and cut butter, place in freezer for 10-15 minutes.
In 1-cup measuring cup combine water, sour cream and vinegar. Set aside.
Combine flour, sugar, salt and xanthan gum in food processor with dough blade.** Process for 5-10 seconds.
Add butter and process until combined into uniform crumb-like mixture.
Add sour cream mixture, process until combined and dough begins to stick together.
Using your hands, and sprinkling the dough with sweet rice flour, form it into a ball incorporating all the crumbs until you have a uniform texture.
Divide dough into 3-4 pieces and flatten each piece into a round thick disk shape. Wrap each piece in wax paper or plastic wrap. Refrigerate for 20 minutes to 1 hour. Can be made 1-2 days in advance.
TURKEY FILLING
Melt butter over medium-high heat in large sauté pan or Dutch oven.
Saute onion, carrot and celery until beginning to soften, about 8 minutes.
Add salt, pepper, tomato paste and thyme. Stir and cook 1 minute.
Add stock, stir and cook until warm, 2-3 minutes.
Make a slurry by whisking together 2 tablespoon cornstarch and 2 tablespoon water. Add half to the pan stirring to thicken. Add the remaining slurry and stir until thickened and smooth.
Add turkey, peas, whipping cream, parsley and sherry (if using). Stir and cook for a about 3 minutes until the mixture is warm.
Divide mixture into ramekins to about ¾ full. I had about 7 cups of filling and used both 1-cup and 2-cup ramekins.
Preheat oven to 400°F.
ROLLING PASTRY TOPPING
Remove dough from fridge, let sit a few minutes or up to 20 minutes until it is pliable.
Unwrap dough and leave the disk in the center of the plastic wrap. Dust both sides with sweet rice flour as you work with it.
Using a rolling pin start in the center of the dough, rolling out toward the edges. Lift and repeat always starting in the center. Roll out to ⅛-inch thickness. Using a round cutter or a bowl, cut dough into circles slightly larger than your dish. I used a 4-inch circle for the 1-cup ramekins and a slightly larger bowl for the 2-cup ramekins.
Cut a small hole in each circle before placing it on top of each pie.
Bake in preheated oven for 20-25 minutes or until pastry is golden brown. Serve.
Notes
*A food processor makes pastry quick and easy. If you're using a stand mixer it takes a little longer to mix the dough.