In this vegetarian polenta casserole recipe, the choice of cheese is as important as which wild mushroom you use. Morel or hen of the woods (maitake) mushrooms give a more “meaty” experience, while chanterelle or cremini mushrooms will have a milder flavor. The polenta recipe calls for rich, nutty Taleggio or fontina cheese, but you can also use a good-quality washed rind cheese like Brie or Gouda.