
Preheat the oven to 450°F. Line a rimmed sheet pan with parchment paper.
Place the sweet potatoes on the prepared sheet pan. Add the melted butter, salt, and cinnamon. Toss to coat, then spread the sweet potatoes in a single layer, not touching.
Bake for 20 minutes. Then flip the potatoes, drizzle the maple syrup and vegetable broth on top, and return to the oven for 20 more minutes, or until the sweet potatoes are caramelized and the maple syrup is reduced and bubbly.
Transfer the sweet potatoes to a platter and drizzle the sauce from the pan on top. Sprinkle with pecans and serve immediately.