Microwave 2 potatoes in their wrappers, 6-8 min, flipping over halfway through; cut in half

Meanwhile, heat 1 tbsp oil in skillet over med-high; pat steak dry, season with salt/pep + sear 3-4 min per side for med-rare (for more well done add 1-2 min per side); for best results, use tongs to hold steak up on its edges, 1 min to render fat crispy; rest 5 min + slice in half

Wipe mushrooms clean + thinly slice; heat 2 tsp oil in same skillet over high, add mushrooms + cook undisturbed 3 min; sauté 3-4 min til browned; add 2 tbsp water + bring to a boil, scraping brown bits; cook 2 min

Serve steak + potatoes with mushroom sauce