1Chop up the onion and zucchini and add them to a bowl with the mushrooms. Toss with olive oil and sprinkle with garlic powder, salt and pepper to season. Set aside.
2Set your oven to broil.
3Heat a cast iron (or other oven safe pan) on the stove over medium-high heat. Toss in your fat of choice.
4While the pan is heating, season your filet liberally with garlic powder, salt and pepper.
5When the pan is hot, place the filet in the pan to cook for two minutes. Flip it an cook for another two minutes and remove from heat.
6Add your vegetables into the pan and transfer it to the oven.
7Broil everything for 5-8 minutes, until the steak is cooked to your liking. We cooked steaks a little over an inch thick and they were cooked to a perfect medium rare in about 6 minutes.
8Check the doneness of steak by using the hand trick here.
9Take out your steak dinner, let it rest for a few minutes and then serve and enjoy.