Mediterranean chicken with roasted vegetables

INGREDIENTS

• 250g baby new potatoes , thinly sliced
• 1 large courgette , diagonally sliced
• 1 red onion , cut into wedges
• 1 yellow pepper , seeded and cut into chunks
• 6 firm plum tomatoes , halved
• 12 black olives , pitted
• 2 skinless boneless chicken breast fillets , about 150g/5oz each
• 3 tbsp olive oil
• 1 rounded tbsp green pesto