Place a lightly greased roasting pan into the oven. Preheat oven and pan to 220°C fan forced. Combine butter, garlic, thyme and parsley together. Dollop evenly over the mushrooms.
Place the mushrooms into the hot roasting pan, roast 10 minutes until tender but hold their shape.
Meanwhile, heat a large frying pan over medium-high heat until hot. Drizzle both sides of the steaks with oil and season. Cook in batches, for 1 minute each side. Add 1 tablespoon hot water to pan and swirl to create pan juices.
Place steak onto serving plates. Top with mushrooms. Spoon over pan juices. Serve with beans and crispy potatoes.
Turn this into a delicious mushroom steak sandwich. Once cooked thickly slice the steak and mushrooms. Pile onto toasted slice bread spread with a little chilli jam or Dijon mustard. Top with sliced tomato and shredded lettuce and sandwich with another slice toasted bread.