Preheat your oven to 425°F (220°C). Position a rack in the middle of the oven.
Prepare your vegetables: peel and cut carrots into 1-inch pieces, break cauliflower into bite-sized florets, and cut potatoes into 1-inch cubes.
In a large mixing bowl, combine all prepared vegetables and minced garlic.
Drizzle olive oil over the vegetable mixture, then sprinkle with salt and pepper. Toss thoroughly until every piece is evenly coated.
Transfer vegetables to a large rimmed baking sheet, spreading them in a single layer. Use two sheets if needed to prevent overcrowding.
Place in the preheated oven and roast for 25-30 minutes total.
After 15 minutes, remove the sheet and stir vegetables with a spatula, flipping any pieces that are browning too quickly.
Return to the oven and continue roasting until vegetables are tender when pierced with a fork and edges are crisp and golden (about 10-15 more minutes).
If using optional ingredients like Parmesan or herbs, add during the final 5 minutes of roasting or sprinkle immediately after removing from the oven.
Serve hot as a versatile side dish.
Notes
For even cooking, try to cut all vegetables to similar sizes.
Pat vegetables completely dry before tossing with oil to promote better browning.
For extra garlic flavor without burning, add minced garlic during the last 10 minutes of roasting instead of at the beginning.
Leftovers can be refrigerated for up to 4 days and are excellent in grain bowls, salads, or wraps.
Nutrition facts are estimates and may vary based on ingredients used, portion sizes, and preparation methods.