Combine olive oil, balsamic vinegar, soy sauce, Dijon mustard, garlic powder, black pepper, and dried parsley in a bowl
Arrange steak, baby carrots, broccoli, red bell pepper, and onion on a sheet pan
Pour the marinade mixture over the steak and vegetables
Season with salt to taste
Roast in the oven until steak is cooked to desired doneness and vegetables are tender
