Add half the potatoes to a microwave-safe bowl, cover + cook 3 min; stir, cover + cook 2-4 min, then rest 2-3 min; mix in salt/pep/fave spices + 1 tbsp oil

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 well done add 1-2 min per side); for best results, use tongs to hold steak up on edges 1 min to render fat; rest 5 min + cut into ½-inch slices

Heat 1 tbsp oil in large skillet over med-high; sauté half the spinach + salt/pep 1-2 min until wilted; add remaining spinach + cook 1-2 min more until all spinach is wilted

Divide all between plates with a container of sauce each