Garlic Mushroom Tray Bake

• 4 portobello mushrooms
• 3 garlic cloves, crushed
• 2 tbsp extra virgin olive oil
• 100 g halloumi, sliced
• 150 cherry tomatoes
• 150 g green beans, ends trimmed
• .5 red onion, thinly sliced
• .25 cup basil leaves
• .5 cup wholemeal couscous