Pot Roast Mushroom Soup. I liked the simplicity of the recipe so I left it mostly as is, though I did add some thyme which I always enjoy with mushrooms. The pot roast mushroom soup came together quickly and easily and turned out great! The beef could only get even more tender after simmering it again and it went really well with the mushrooms that were sauteed in butter. The soup was nice and tasty and full of flavor.