Preheat oven to 425°F (220°C). Line a baking sheet with parchment paper.
Prep vegetables: Wash, peel, and chop all vegetables into similar-sized pieces.
Toss together: In a large mixing bowl, combine vegetables with olive oil, rosemary, garlic, salt, and pepper.
Spread evenly: Arrange vegetables in a single layer on the baking sheet, ensuring they don’t overlap.
Roast: Place in the oven for 35–40 minutes, flipping halfway through, until golden brown and tender.
Finish: Remove from oven, drizzle with lemon juice if desired, and season to taste.
Serve: Enjoy warm as a side dish, salad topper, or wholesome meal base.