Creating your Vegan Thanksgiving Pot Pie is straightforward if you follow these simple steps:

1. Prepare the Filling: In a large skillet, heat olive oil over medium heat. Add diced onion and garlic, sauté for about 3-4 minutes or until softened.
2. Add Vegetables: Stir in carrots and potatoes, cooking for an additional 5-7 minutes, until they begin to soften.
3. Season the Vegetables: Add frozen peas, chopped green beans, dried thyme, dried rosemary, salt, and pepper. Mix well for 1-2 minutes.
4. Make the Sauce: In a separate bowl, whisk together the vegetable broth, plant-based milk, and flour until smooth. Gradually pour this mixture into the skillet, stirring continuously.
5. Thicken the Mixture: Bring the mixture to a simmer as it thickens. Mix in the nutritional yeast, if using. If the sauce isn’t thick enough, add the cornstarch mixture and continue to stir until combined.
6. Remove from Heat: Once the filling reaches a creamy consistency, remove it from the heat and let it cool slightly.
7. Preheat the Oven: Meanwhile, preheat your oven to 400°F (200°C).
8. Assemble the Pie: Roll out the vegan pie crust into a pie dish. Pour the cooled filling into the crust, spreading it evenly.
9. Top with Crust: Place another pie crust on top of the filling, sealing the edges by crimping them together using your fingers or a fork. Cut a few slits in the top crust for steam to escape.
10. Bake the Pie: Place the pot pie in the preheated oven and bake for 45-50 minutes, or until the crust is golden brown.
11. Cool and Serve: Once baked, remove the pot pie from the oven and allow it to cool for about 10-15 minutes before serving.

This detailed process will guide you in making a delicious Vegan Thanksgiving Pot Pie that everyone will love!