Step 1: Preheat oven to 375°F (190°C). Grease a 9×13-inch baking dish.
Step 2: Place sweet potato cubes in the prepared baking dish in an even layer.
Step 3: In a medium saucepan over medium heat, melt butter. Stir in brown sugar, maple syrup, vanilla, cinnamon, nutmeg, and salt until smooth and bubbly, about 3-5 minutes.
Step 4: Pour the glaze evenly over the sweet potatoes, tossing gently to coat.
Step 5: Cover the dish with aluminum foil and bake for 25 minutes.
Step 6: Remove foil, stir gently, and bake uncovered for another 15-20 minutes until potatoes are tender and glaze is thickened.
Step 7: Let cool for 5 minutes, then garnish with chopped pecans if desired before serving.