Arrange sweet potatoes in an even layer in a large baking dish. Combine maple syrup, avocado oil, lemon juice, salt, and pepper in a 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, 30 to 45 minutes more.
Notes:
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Buy ready-cut sweet potato cubes found at most grocery stores.