Earlier this week we rounded up some vegetarian and vegan comfort food recipes To give this pot pie a deep, savory flavor, I adapted my favorite umami-packed vegetarian gravy recipe from AllRecipes.com. It contains nutritional yeast, which has a nutty, somewhat cheesy flavor. The crust is adapted from Savvy Vegetarian and uses Earth Balance Vegan Buttery Sticks for a surprisingly buttery flavor and texture.