Preheat oven to 375F/180C/160C Fan. Line baking tray with greaseproof or foil for easy cleaning afterwards.
Place all vegetables on tray and toss them with the oil and spices. Mix them well so all are thoroughly covered. Make sure vegetables are in a single layer before cooking in the oven for 20 minutes.
After 20 minutes turn all the vegetables and bake for another 20 minutes or until the vegetables are tender.
Cooked couscous according to packet instructions with boiling water and a stock cube. Serve hot or cold.