Preheat oven to 450°; mix potatoes with 1 tbsp oil + salt/pep then spread on a sheet pan; roast 15-18 min til tender

Meanwhile, heat a skillet with 2 tsp oil over med/high; pat steaks dry then season with salt/pep + sear 3-4 mins per side (for well done add 1 min per side); rest 5 min before serving, reserving pan juices

Wipe mushrooms clean + thinly slice; dice shallot; heat 1 tbsp oil in same skillet over high, add mushrooms + shallots; cook undisturbed 3 min; sauté3-4 min til browned; add 2 tbsp water + bring to a boil, scraping brown bits; cook 2 min

Divide all between plates; top steak with mushroom sauce—delish!