Preheat your oven to 375°F (190°C). Spray a large sheet pan with cooking spray to prevent sticking.
Peel and dice the sweet potatoes into 1-inch cubes so they cook evenly and get tender with crisp edges.
In a small bowl, whisk together the melted butter, maple syrup, cinnamon, and salt until smooth and well blended.
Spread the sweet potatoes in a single layer on the prepared pan. Pour the maple butter mixture over them and toss to coat evenly.
Roast for 35 minutes, stirring halfway through, until golden, caramelized, and fork-tender.
Remove from the oven and serve warm. Enjoy as a comforting side dish or vegetarian main.