Remove mushroom stems, and finely chop; set caps aside.
Combine chopped mushroom stems, cheese, parsley, and Italian dressing in a medium bowl, stirring well. Spoon evenly into mushroom caps, and place in a shallow baking dish.
Bake at 350 for 15 to 20 minutes or until thoroughly heated.
Microwave Instructions: Prepare mushroom mixture as directed above. Spoon chopped mushroom mixture evenly into mushroom caps. Arrange mushroom caps in a shallow baking dish. Microwave, uncovered, at HIGH 3 to 4 minutes or until cheese melts, rotating a quarter-turn every minute.
