In a bowl place the halved button mushrooms, olive oil, garlic powder, Worcestershire sauce, salt and pepper and gently mix together until all the mushrooms are coated.
400 g Button Mushrooms, 2 tablespoon Olive Oil, ½ teaspoon Garlic Powder, ½ teaspoon Worcestershire Sauce, ¼ teaspoon Salt, ⅛ teaspoon Black Pepper