Preheat the oven to 200°C (400°F).
Chop vegetables such as zucchini, bell peppers, carrots, and sweet potatoes into equal-sized pieces.
Place vegetables on a baking tray, drizzle with olive oil, and season with salt and black pepper.
Roast for 20–25 minutes, turning halfway, until vegetables are tender and lightly caramelized.
In a large bowl, arrange fresh salad greens or lettuce as the base.
Add warm roasted vegetables on top.
Prepare dressing by mixing lemon juice, olive oil, and a pinch of herbs; drizzle over the salad and toss gently before serving.