Special Scallion 'Shrooms

Ingredients

• 12 large (2 1/2-inch-diameter) cremini or white mushrooms with stems
• 1/3 cup finely chopped white or yellow onion
• 1 garlic clove, minced
• 1 tablespoon extra-virgin olive oil
• 3 ounces (a little less than 1/2 cup) cream cheese, softened
• 1/4 cup freshly grated parmesan cheese
• 1 tablespoon chopped fresh Italian parsley leaves
• 1 scallion, white and green parts, chopped
• 1/2 teaspoon table salt
• 1/4 teaspoon freshly ground black pepper
• 1/8 teaspoon cayenne pepper (optional)