Preheat oven to 400ºF. Coat a shallow baking dish with cooking spray. Season both sides of salmon with salt and pepper (and other seasonings, if desired); place salmon in prepared baking dish. Roast until salmon is fork-tender, about 15 minutes. Toss together chickpeas, onion and peppers; season to taste and add some fresh chopped herbs (optional). Roast, stirring a few times, until lightly browned, 20-25 minutes. Serve salmon, drizzled with lemon juice, with chickpea-vegetable mixture and yogurt on the side.