Enjoy these savory mushrooms as a topping for steak or burgers, or on their own as a rich umami side dish.
Heat 1 tablespoon butter and oil in a large skillet over medium-high heat. Add mushrooms, pepper and salt; cook, stirring, until cooked through and starting to brown, 6 to 8 minutes. Reduce heat to medium. Stir in garlic and the remaining 1 tablespoon butter. Cook until the garlic is softened, 1 to 2 minutes more. Remove from heat and stir in parsley.