01 -
Preheat the oven to 350°F (175°C). Lightly oil a small baking dish.
02 -
Gently wash and stem mushrooms, then pat dry. Reserve the stems for another recipe.
03 -
In a bowl, mix clams, green onion, minced garlic, garlic salt, butter, and oregano. Add breadcrumbs, egg, and reserved clam juice; mix thoroughly. Stir in Parmesan, Romano, and Mozzarella cheeses.
04 -
Stuff each mushroom cap with about 1 1/2 teaspoons of the clam mixture, mounding slightly.
05 -
Arrange stuffed mushrooms in the oiled baking dish. Drizzle with 1/4 cup melted butter. Cover and bake for 35 to 40 minutes.
06 -
Remove the cover, sprinkle with remaining grated Mozzarella cheese, and return briefly to the oven to melt the cheese.
07 -
Garnish with freshly diced parsley and serve warm with lemon wedges for added flavor.