Get out two sheet pans, cover with foil for easy clean up or omit this step.
Take cubed steak and cover with 1 T olive oil. Sprinkle with your favorite seasoning, I like Mrs. Dash Original seasoning and add my own salt. Stir this in and make sure all pieces are covered. Next lay these out on one of the cookie sheets.
In another bowl, mix together the vegetables, 1 T olive oil, and salt and pepper. Spread this out over the other cookie sheet. It is best if you can keep these pieces separated from each other, they will actually roast and not steam.
Put both pans into a 425 F degree oven for 10-15 minutes or until the steak temps at least 145 internally or until your preference has been achieved. Check the vegetables and keep cooking until they are to your liking.