Chop all the vegetables into similar size pieces, about 1 square inch. Note: Use a vegetable peeler to peel the broccoli stem and slice the stem as well.
Toss the cut vegetables with the olive oil, Italian seasoning, salt, pepper and garlic powder.
Arrange the vegetables in a single layer on a large baking sheet.
Roast 20 – 25 minutes or until vegetables are tender but still have some crunch.