Preheat your oven to 400°F (200°C). Line a large baking sheet with parchment paper or lightly grease it to prevent sticking.
Wash and peel the potatoes and carrots. Cube the potatoes and slice the carrots into thin rounds or sticks, depending on your preference.
Wash the zucchinis and slice them into rounds. Try to keep the slices of all vegetables approximately the same thickness for even cooking.
In a large mixing bowl, combine the cubed potatoes, sliced carrots, and zucchini slices.
Add the minced garlic, olive oil, dried thyme, rosemary, oregano, salt, and pepper to the bowl. Mix everything together until the vegetables are uniformly coated with the oil and seasonings.
Arrange the seasoned vegetables in an even layer on the prepared baking sheet. Ensure they are in a single layer and not overcrowded to promote even roasting.
Place in the preheated oven and roast for about 25-30 minutes, or until the vegetables are tender and golden brown. Give the vegetables a gentle stir halfway through the cooking time to ensure they brown evenly.
After roasting, take the vegetables out of the oven. If desired, sprinkle with freshly chopped parsley for a burst of color and additional flavor.
Serve hot as a side dish with your favourite protein or enjoy them on their own as a tasty and healthy snack.