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Preheat oven to 450.
In a non-stick medium skillet on medium/low heat, add oil and onions, cook 8-10 minutes until golden.
Add butter and brown sugar to onions, remove from heat, cover to keep warm.
Preheat cast iron skillet on high heat for about 10 minutes until smoking.
Rub little oil on both sides of steak, season well with Kosher salt and black pepper.
Add steak to hot skillet, cook 2 minutes, flip and cook 1 minute, then place cast iron pan in hot oven.
Stand by, using an instant read thermometer, check temperature in the middle is 131-135 for medium rare; I like to take out at 130 and let it sit.
Top with blue cheese crumbles, tent with foil for 10 minutes to let meat rest.
Serve sliced on bed of onions, enjoy!