Tip: Another recipe with the exact-same name "Oven Roasted Vegetables" ranks higher.
Heat the oven to 450. Place the zucchini, squash, peppers, asparagus, and onion in a large roasting pan. Toss with the olive oil, salt, and pepper to mix and coat. Spread in a single layer in the pan. Roast for 30 minutes, stirring occasionally, until the vegetables are lightly browned and tender.
Any combination of vegetables can be used.