Season the steaks on both sides with salt and pepper.
Heat some avocado oil in a cast iron pan and once smoking add in the steaks. Now you can cook the steak to your liking. I like to go by touch and feel but use a cooking thermometer for a more accurate cook.
After flipping the steaks over I add in the butter and baste the steaks in the butter. Once done I remove them from the pan and then add the spinach to the same pan.
Cook the spinach till it wilts down and then add your cream and season with salt and pepper. Cook longer to dry out the liquid if you prefer it that way or leave it a bit more fluid.