These classic stuffed mushrooms are a perfect appetizer for any dinner party. The ingredients you will need are: 1 pound of button mushrooms, 1/2 cup of breadcrumbs, 1/4 cup of grated Parmesan cheese, 2 cloves of garlic (minced), 2 tablespoons of chopped fresh parsley, 2 tablespoons of olive oil, salt and pepper to taste. To prepare the stuffed mushrooms, start by preheating your oven to 375°F (190°C). Remove the stems from the mushrooms and set them aside. In a bowl, combine the breadcrumbs, Parmesan cheese, minced garlic, chopped parsley, olive oil, salt, and pepper. Mix well until all the ingredients are evenly combined. Take each mushroom cap and fill it with the breadcrumb mixture, pressing it down gently. Place the stuffed mushrooms on a baking sheet and bake for about 20 minutes, or until the mushrooms are tender and the tops are golden brown. Serve hot and enjoy!