Preheat the oven to 400°F and line a large baking sheet with parchment paper.
Place the squash cubes on the prepared baking sheet and toss with olive oil, maple syrup, cinnamon, salt and pepper. Spread the squash into a single layer to avoid them overlapping.
Roast until the edges are golden brown and begin to caramelize, about 30 to 35 minutes, tossing halfway through. Transfer to a serving dish and garnish with rosemary.
Notes
Storage: Store leftovers for up to 3 days in the frdge and reheat in a hot oven.Make ahead: You can toss the squash in the seasonings a couple of hours before you are ready to cook it.Tip: Check out my post to learn how to prep butternut squash quickly and easily.