01 - Preheat oven to 400°F. Line a baking sheet with parchment paper.
02 - Spread sweet potato cubes evenly on the prepared baking sheet.
03 - In a small saucepan over medium heat, melt the butter. Stir in maple syrup, pecans, cinnamon, salt, and black pepper. Cook for 2 minutes, stirring constantly, until pecans are fragrant and mixture is glossy.
04 - Pour half of the maple pecan glaze over the sweet potatoes. Toss to coat evenly.
05 - Roast in the preheated oven for 25 minutes.
06 - Remove from oven, toss the sweet potatoes, then drizzle with the remaining glaze.
07 - Return to oven and roast for an additional 10 minutes, or until sweet potatoes are caramelized and tender when pierced with a fork.
08 - Transfer to a serving platter and garnish with chopped parsley, if desired. Serve warm.