Boil the potatoes

• Place the potatoes in a saucepan and cover with cold salted water.
• Bring to a boil and cook until tender.

Make the creamy mash

• Drain the potatoes and return them to the pan.
• Mash with the butter and warm milk until smooth and creamy.
• Season with salt and pepper.

Cook the mushrooms

• Heat the olive oil in a frying pan over medium heat.
• Sauté the onion and garlic until soft.
• Add the mushrooms and cook until golden.

Build the mushroom sauce

• Pour in the beef stock and let it reduce slightly.
• Stir in the cream and simmer until thickened.
• Season with salt and pepper.

Sear the steak

• Season the steak with salt and pepper.
• Sear in a hot pan to the desired doneness.
• Rest the steak before slicing.

Plate and serve

• Spoon the creamy mash onto plates.
• Top with sliced steak and pour over the mushroom sauce.