Preheat the Oven to 450 degrees F. Cut the carrots, zucchini, squash, and bell peppers into thin 2-inch-long strips. On a large, heavy baking sheet, toss the vegetable strips, onion, oil, dried herbs, and 2 teaspoons each of salt and pepper to coat. Transfer half of the vegetable mixture to another large, heavy baking sheet, and arrange the vegetables evenly over both sheets. Bake, stirring after the first 10 minutes, until the carrots are tender and the other vegetables begin to brown, about 20 minutes total.