I used two of my favorite kitchen gadgets to prepare this meal, the Anova Sous Vide and the Instant Pot Duo. I use the Sous Vide to thoroughly cook the meat to 125 degrees. Then I sear the steak on a very hot, cast iron griddle. This method is consistently better than grilling.
My favorite mashed potato dish is Mashed Potatoes with Caramelized Root Vegetables. This is an old America’s Test Kitchen recipe that involves browning the root vegetables in butter for 14 minutes. I typically use carrots and parsnips as my root vegetables. I left the skins on the Yukon Gold potatoes for a bit more flavor. The Instant Pot Duo does a pretty good job at cooking the potatoes while I am caramelizing the root vegetables and frees up a burner.