Microwave potatoes in bag for 6-7 min; let cool 1-2 min, transfer to a bowl, season with 1 tbsp oil, salt/pep + crème fraîche; mash potatoes

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

Divide ingredients to 2 plates