Preheat the oven to 200C/400F. Line a large baking sheet with parchment paper.
Slice your rutabagas into thin, 1/8-inch slices. Place them in a mixing bowl. Add your olive oil and mix well. Add the Rosemary, salt, and pepper, and mix until the rutabaga is well coated in it.
Transfer the seasoned rutabaga fries to the lined sheet and bake for 15-17 minutes, tossing every 5 minutes.
Remove from the oven and enjoy immediately.
Notes
TO STORE: Leftover fries should be stored in the refrigerator, covered, for up to 3 days. TO FREEZE: Place uncooked fries in a ziplock bag and store them in the freezer for up to 6 months. You can cook them from frozen, but increase the bake time to 25-30 minutes. TO REHEAT: Either reheat in a preheated oven or a non-stick pan. Avoid microwaving them or else they will be limp and soggy.