Halloumi Eggplant One Tray Bake with Seed Crust

• 1.4 kg passata*
• 1 large eggplant
• 180 g halloumi, cubed
• 800 g chickpeas, drained, rinsed
• 2 tbsp balsamic vinegar
• 2 tbsp mixed herbs
• 0.5 cup seed mix (such as pumpkin, sunflower, chia, sesame)