To prepare a vegetarian pot pie with puff pastry crust, you'll first need to prepare the filling. Preheat the oven to 425 degrees Fahrenheit (230 degrees Celsius). Place the vegetable broth, vegetable bouillon cubes, thyme, salt, pepper, and paprika in the bottom of an 8-inch (22-centimeter) pie pan. Pour in enough water to cover the vegetables. Bake the pie for 20 to 25 minutes, or until the top is golden brown.