Preheat oven to 425F/Gas 7.  Line an oven pan with foil or spray with an oil spray.

Trim and peel the parsnips, carrots, and sweet potatoes; cut into approximately 1" cubes.  Peel onion and dice in a 1/2 inch dice. 

Put the cubed and diced veggies in the pan and drizzle the oil over them; toss to coat.

Use scissors to chop the basil and stir into veggies.  Season with salt and pepper.

Roast approximately 45 minutes, or until veggies are tender. 

Excellent with a roast beef or pork loin,