Creating the perfect Spinach and Mushroom Pot Pie can be straightforward if you follow these simple steps:

1. Preheat Oven: Preheat your oven to 400°F (200°C).
2. Sauté Onions: In a large skillet, heat olive oil over medium heat. Add chopped onion and cook until translucent (about 5 minutes).
3. Add Mushrooms: Stir in sliced mushrooms and cook until they release their moisture and become tender (about 5-7 minutes).
4. Incorporate Spinach: Add the chopped spinach, garlic, thyme, salt, and pepper. Cook for another 2-3 minutes until spinach is wilted.
5. Thicken Filling: Sprinkle flour over the mixture and stir well. Slowly add vegetable broth while stirring continuously.
6. Add Cream: Pour in the heavy cream or plant-based milk, stirring until the mixture thickens slightly. Mix in soy sauce if using.
7. Prepare Pie Crust: Roll out your pie crust and place it into a pie dish. Pour the mushroom and spinach filling into the crust.
8. Cover and Seal: Add another layer of pie crust over the filling, crimping the edges to seal. Cut a few slits in the top to allow steam to escape.
9. Egg Wash (Optional): Brush the top crust with a beaten egg for a golden finish.
10. Bake: Place the pie in the preheated oven and bake for 30-40 minutes, or until the crust is golden and flaky.
11. Cool: Allow the pot pie to cool for 10-15 minutes before serving to help set the filling.

Following these steps will guide you in creating this incredible dish effortlessly.