Pre-heat oven to 400°F
Mix the cubed vegetables with the olive oil and salt in a large bowl
Pre-heat two large sheet pans for 4 or 5 minutes in the 400° oven.
Remove from the oven and spread 1/2 of the vegetables on each pan, trying to separate each of the pieces.
Roast for 60 minutes, tossing a couple times
Garnish with fresh thyme or chopped parsley