Mix Butter, Flour and Seasoning: In a large pot or deep skillet over medium heat, melt the butter then whisk in the Italian seasoning, salt, pepper and flour. Cook for 2 minutes, stirring.
Add Stock and Milk: Whisk in the stock and almond milk and continue mixing for another 2 minutes.
Add the Vegetables: Add in the peas, corn, chickpeas, potatoes, celery and carrot. Bring to a light simmer then reduce the heat to medium-low and simmer until the potatoes are tender, stirring often for 10-15 minutes.
Cool Mixture & Preheat Oven: Remove the pot from the heat and let cool for at least 10 minutes. While you're waiting, preheat the oven to 425℉. Lightly spray a 9-inch pie dish with non-stick cooking spray.
Prepare the Pie Crust: Press one crust into the pie pan and lightly perforate the bottom of the crust with a fork a number of times. Omit this step for a crustless/single crust pot pie.
Add Filling & Topping: Add the vegetable filling to the pie dish and then place the second crust on top. Using a fork, press along the edges of the pie to form a textured, sealed crust. Brush the top of the pie lightly with melted plant-based butter, if desired.
Bake: Bake for 25-30 minutes. Watch the pie after 20 minutes to ensure it's not browning too quickly, if so, lightly cover with a piece of foil and continue baking.
Cool & Serve: Let sit 15 minutes before serving, then slice and enjoy!