Step 1

Clean mushrooms well, removing steams and also removing gills, if desired. Removing the gills isn't necessary, but if you don't the butter sauce will turn brown. Gills can be removed with the tip of a spoon lightly scraped against the mushrooms. Preheat oven to 350 degrees F.

Step 2

In a mixing bowl combine clams, onions, garlic, oregano, and cooled melted butter. Mix well. Add the breadcrumbs, egg, and clam juice, stir well. Stir in grated Parmesan and 2 tablespoons grated mozzarella.

Step 3

Fill the mushrooms with the stuffing. You should have enough to slightly mound the stuffing. Place the mushrooms in a square baking dish sprayed with cooking spray. Pour melted butter over the mushrooms. Cover (suggested) and bake in the preheated oven for 40-45 minutes. Uncover, sprinkle remaining mozzarella over the top of the mushroom, and bake for 5 more minutes, or until the cheese is just melted. Garnish with fresh parsley and serve hot.