Preheat oven to 375 degrees. Clean mushrooms by rinsing them off with cool water under the tap, and then brushing the mushrooms with a damp paper towel to knock off any dirt that may be on the mushrooms. Arrange the mushrooms in two shallow dishes, steam side up. Put cheese on top of mushrooms and sprinkle with bacon bits. Cover pans with foil and bake at 375 degrees for 20 minutes. Remove from oven; sprinkle with parsley.