Heat oven to 425°F with a rimmed baking sheet inside to preheat.
Peel the turnips and cut them into 1-inch wedges.
In a large bowl, toss turnips with olive oil, salt, pepper, thyme, garlic, lemon zest, and red pepper flakes.
Spread the turnips on the hot sheet in a single layer, cut sides down when possible.
Roast for 15 minutes. Stir and flip, then continue roasting 8–10 minutes until tender and golden.
Sprinkle Parmesan over the hot turnips and return to the oven for 2–3 minutes to melt and lightly crisp.
Finish with parsley, taste for salt, and serve hot.
Notes
Variation: Swap Parmesan with Pecorino Romano or add a squeeze of lemon juice before serving. For extra richness, drizzle with a touch of melted butter. Storage: Refrigerate leftovers in an airtight container for up to 4 days; reheat on a hot sheet pan at 400°F until crisp.This recipe is an original creation inspired by classic Easy Oven-Roasted Turnips with Thyme and Parmesan flavors. All ingredient ratios and instructions are independently developed.