Preheat oven to 220°C (or 200°C fan bake).
Cut capsicum into wedges and toss on a lined oven tray with olive oil. Season with salt, pepper, balsamic vinegar and oil and cook on upper oven rack for 15-20 minutes, until tender.
In a bowl, mix together breadcrumbs and basil pesto. Place salmon fillets on a second lined oven tray flesh side up. Season with salt and top with pesto breadcrumb. Cook salmon on lower oven rack below veggies for 6-8 minutes or until cooked to your liking.
Zest and juice lemon into a small bowl, add yoghurt and mix to combine. Thinly slice spring onion.
Divide a bed of mesclun between plates and top with roasted veggies. Drizzle over lemon yoghurt and top with salmon. Garnish with spring onion