Preheat the oven to 400°F. Line a large baking sheet with parchment paper and set aside.
Slice the carrots into thin diagonal pieces, keeping them as uniform as possible so they roast evenly.
Slice the zucchini into half-moon shapes, similar in thickness to the carrots, to ensure even cooking.
Add the sliced carrots and zucchini to a large mixing bowl. Drizzle with olive oil and sprinkle with Italian seasoning, then toss until the vegetables are evenly coated.
Spread the vegetables out in a single, even layer on the prepared baking sheet, making sure they are not overcrowded.
Roast for 15 minutes, or until the carrots and zucchini are tender and lightly golden around the edges. Remove from the oven and serve immediately.