Creating your Vegan Thanksgiving Pot Pie is a straightforward process that yields incredible results. Follow these steps:

1. Preheat your oven to 400°F (200°C).
2. Prepare the filling: In a large skillet, heat olive oil over medium heat. Add the diced onion and garlic, sautéing until translucent.
3. Add vegetables: Stir in the carrots, celery, potatoes, and peas. Cook for about 5-7 minutes, until the vegetables begin to soften.
4. Season the mixture: Add the dried thyme, rosemary, sage, salt, and black pepper, stirring well to combine.
5. Thicken the filling: Sprinkle the flour over the vegetables and stir for 1-2 minutes to coat everything evenly.
6. Add liquid: Gradually pour in the vegetable broth and almond milk, stirring continuously to prevent lumps. Allow the mixture to thicken, cooking for about 3-5 minutes.
7. Add corn: Stir in the corn and nutritional yeast (if using), mixing until everything is well combined. Remove from heat.
8. Fill the pie: Place the pre-made pie crust in a pie dish. Pour the vegetable filling into the crust, spreading it evenly.
9. Cover the pie: If desired, place a second pie crust over the top, sealing the edges. Cut a few slits in the top crust to allow steam to escape.
10. Bake: Place the pot pie in the preheated oven and bake for 45-60 minutes, or until the crust is golden brown. You can cover the edges with foil if they brown too quickly.
11. Cool and serve: Remove from the oven and let it cool for at least 10 minutes before slicing. Garnish with fresh parsley if desired.

These simple steps ensure you create a delicious dish that everyone will love during your Thanksgiving celebration.