Preheat oven to 425°F (220°C).
Halve potatoes if large; keep small ones whole.
Cut vegetables into similar-sized pieces for even roasting.
Toss everything with olive oil, salt, pepper, and garlic.
Spread in a single layer on baking sheet.
Roast 25–35 minutes, turning once, until caramelized and tender.
Finish with herbs, citrus, or flaky salt if desired.