Preheat the oven to 180C/350F.
Place the potatoes on a baking tray and use a fork to pierce them all over. Rub in a glug of olive oil and a good pinch of salt, then bake for 1 hour and 20 minutes. After, crank the heat to 220C/430F and cook for another 10 minutes, or until deep golden and crisp on the outside and fluffy in the centre.
Towards the end of the cooking, prepare the steak. Use paper towels to pat it dry, then generously season both sides with salt and pepper.
Place a large heavy-based or cast-iron pan over high heat. Once hot, add the oil, leave for 5-10 seconds, then carefully add the steak. Leave to fry for around 2 minutes and 30 seconds, then flip and cook for another 1 minute and 30 seconds. Add the butter, thyme and whole garlic cloves and baste the steak for 1 further minute. Remove and place on a plate one side to rest, leaving any excess fat behind. Lower the temp to medium.
Let the pan cool down, then add the shallots to the leftover fat. Fry until soft and golden, then add the stock. Swiftly stir in the cream cheese until it blends into a sauce, then stir in the Dijon and resting juices from the steak. The sauce should be pretty thick already, but if it's not, just gently simmer for a couple of minutes to thicken it. If you over thicken the sauce, just stir in a splash more stock (or even water). Check for seasoning and adjust if needed.
To serve, slice the potatoes open, then add the butter and a hefty pinch of salt to each. Use a fork to mash the potatoes. Slice the steak into cubes and add to the potatoes, then drizzle over the sauce. Finish with a good pinch of black pepper and plenty of fresh chives, then tuck in and enjoy!