Microwave potatoes in bag for 6-7 min; open bag, add butter, salt/pep, close bag + let cool 1-2 min

Wash mushrooms; thinly slice onion + mushrooms; heat 1 tbsp oil in skillet over med-high, add onions + cook 4-5 min; add mushrooms, salt/pep + cook 3-4 min more

Heat 1 tbsp oil in skillet over med-high; pat both steaks dry, season with salt/pep + sear undisturbed 2-3 min; flip + cook an additional 2-3 min for med-rare (for more well done add 1-2 min per side); rest steaks 5 min

Add potatoes to a bowl + mash with butter; divide between plates with steak, top steak with mushrooms + onion—looks good!