Roll, pan, and bake the potpie shells. To bake the shells pre-heat the oven to 375 degrees F. While the oven is heating freeze the raw pie shells for 15 to 20 minutes. Then, line the shells with parchment paper and fill with pie weights. Slide the pie tins into the oven and bake for about 20 minutes. Then, remove the weighs and bake the shells for 5 more minutes.
Set the baking sheet on a wire rack and let the shells cool to room temperature while you make the filling. Melt the butter in a large pot or Dutch oven over medium heat and sauté the onions, celery, and carrots until tender, 5 to 10 minutes.
Meanwhile, make the slurry. Put the flour in a bowl and whisk in the stock until the flour dissolves.
When the vegetables are tender, add the garlic granules and poultry seasoning to the pan and cook until fragrant, about 30 seconds. Turn the heat under the pan up to medium-high and whisk in the slurry. Cook, whisking constantly, until the mixture starts to thicken to a gravy consistency. Then bring the mixture to a boil and cook for 2 minutes, stirring often to prevent the mixture from sticking to the bottom of the pan and scorching.
Stir in the bouillon and the turkey pieces. Lower the heat and simmer, uncovered, for 10 to 15 minutes, or until the turkey is cooked through, stirring often. Add the peas and corn and simmer for another 5 minutes. Take the pan off the heat and stir in the parsley and lemon juice. Season to taste with salt and pepper. (At this point the filling can be cooled, transferred to airtight containers, and refrigerated for up to 3 days or frozen for up to 1 month. Thaw in the refrigerator overnight; gently rewarm in the microwave or in a saucepan on the stovetop.)
To assemble the potpies, preheat the broiler to low. Line a baking sheet with parchment paper.
Carefully unmold the potpie shells and set them on the lined baking sheet. Divide the filling among the shells and top with warm apple fennel stuffing. Slide the baking sheet under the broiler for 2 to 3 minutes, or until the stuffing begins to toast up.
Serve with cranberry sauce, heaped either on top or on the side.