To prepare a crust for veggie pot pie recipe, you'll first need to prepare the pie crust. Preheat the oven to 425 degrees Fahrenheit (230 degrees Celsius) and grease and flour two 9x13-inch baking pans. Set aside. Using an electric mixer, cream the butter and sugar together until light and fluffy. Add the eggs and vanilla and mix until combined. Pour the mixture into the prepared pie shells and bake for 20 minutes or until the top is golden brown. Remove from oven and allow to cool before serving.