Preheat the oven to 400 degrees F.
Add the butternut squash and potato cubes into a large bowl.
Drizzle the avocado oil over top, tossing the cubes to coat.
Evenly spread the cubes out on a baking tray lined with parchment paper or a silicon baking mat.
Mix the cinnamon, salt and xylitol together in a small bowl.
Cover the tray with aluminum foil. Bake for 20-25 minutes, flipping the cubes over halfway through the time.
Open the oven. Sprinkle the cinnamon mixture over the cubes, stirring around to coat. Bake for another 5 minutes.
Remove from the oven. Be careful as they will be very hot.
Let them cool slightly before serving. This allows them to firm up a bit, making them easier to handle and enhancing their flavors.
Serve as a side dish or as part of a holiday spread!