Preheat your oven to 400°F (200°C).
In a large mixing bowl, combine the peeled and cubed turnips, minced garlic, olive oil, dried rosemary, dried thyme, salt, and black pepper. Toss everything together until the turnips are evenly coated with the oil and seasonings.
Spread the seasoned turnips in a single layer on a large baking sheet. Ensure they are not overcrowded, as this will steam them rather than roast them, preventing a nice crispy exterior.
Roast for 25-35 minutes, flipping the turnips halfway through, until they are tender when pierced with a fork and have lovely caramelized edges.
Once roasted to perfection, remove from the oven. Garnish with fresh chopped parsley, if desired, and serve immediately.