Peel and cut the sweet potatoes into 1.5 inch cubes.
Arrange sweet potatoes in an even layer in a 9-by-13-inch glass baking dish. Combine maple syrup, butter, lemon juice, salt and pepper in small bowl. Pour the mixture over the sweet potatoes; toss to coat.
Cover and bake the sweet potatoes for 15 minutes. Uncover, stir and cook, stirring every 15 minutes, until tender and starting to brown, 45 to 50 minutes more.
TIPS & NOTES
Make Ahead Tip: Cover and refrigerate for up to 1 day. Just before serving, reheat at 350°F until hot, about 15 minutes.