Heat evoo in a 12-inch skillet over medium-high heat. Add steak and sear until nicely browned, about 4 to 5 minutes on each side. Remove and let rest.
Add parsnips and carrots and sauté 6 to 8 minutes or until slightly browned and beginning to soften. Add mushrooms and sauté 2 minutes. Add stock and wine and bring to a boil.
Reduce to a simmer and cook 8 to 10 minutes or until vegetables are tender and sauce is reduced and thickened. Stir in parsley and season to taste with salt and pepper.
Thinly slice steak against the grain and return to pan for 2 to 3 minutes or until heated through and coated in sauce. Divide between 4 shallow bowls.