Preheat the oven to 400 degrees.
Line the bottom of a 9-10 inch pie dish with one of the crusts.
Add the frozen veggies. Drain and rinse the beans and add them as well.
Simmer the potatoes in salted water for 8-10 minutes until softened. Drain and add them to the pie dish.
Melt 2 tbsp of vegan butter in a saucepan and add the diced onion and mushrooms. Saute for 5-7 minutes over medium heat. Add the garlic and saute for another 1-2 minutes.
Add the remaining 3 tbsp of butter. Once melted, add the flour and mix until the onions are coated.
Add in all the spices. Slowly add the milk and broth. Mix well and reduce heat. Simmer for about 3-5 minutes or until the mixture thickens. Salt and pepper to taste.
Pour the gravy mixture into the pie dish to coat. You don't have to mix it, it will settle while it bakes. Top with the second pie crust and pinch to seal the edges of the crust.
Cut a small x into the crust to vent. If desired, brush non-dairy milk on top as a wash. to Bake for 45 minutes. Let it rest for ten minutes before slicing.
Store any leftovers in an airtight container in the fridge for 3-4 days. The crust will get softer by the second day so it is best enjoyed fresh.
I have not frozen the pot pie once cooked, but once assembled you can cover and freeze the pot pie to bake at a later time. When you are ready to bake, cover with foil and bake for 30 minutes. Remove the foil and bake for another 20-30 minutes.