1
Adjust rack to top position and preheat oven to 425 degrees. Wash and dry produce.
Trim, peel, and cut carrots on a diagonal into ½-inch-thick pieces. Halve, peel, and cut onion into ½-inch-thick wedges; mince one or two wedges until you have 1 TBSP (2 TBSP for 4 servings). Trim and halve zucchini lengthwise; cut crosswise into ½-inch-thick half-moons.