Preheat the oven to 425°F (220°C).
Prepare the veggies. Arrange cabbage wedges, carrots, and bell pepper on a parchment-lined baking sheet.
Season. Drizzle with sesame oil, add maple syrup, and sprinkle with salt and pepper. Toss lightly.
Roast. Bake for 25–30 minutes, flipping halfway, until cabbage edges caramelize and carrots are tender.
Make the dressing. In a small bowl, whisk together miso, vinegar, soy sauce, sesame oil, maple syrup, garlic, and ginger. Add warm water a little at a time until smooth.
Assemble the salad. In a large bowl, combine roasted veggies with chickpeas. Pour dressing over the top and toss.
Finish. Sprinkle with sesame seeds and serve warm or chilled.