Preheat the oven to 400 degrees F. Put the sweet potato chunks in a 3-quart casserole dish in an even layer.
Bring the maple syrup to a gentle boil in a small saucepan over medium-high heat. Boil for 1 minute, then add the broth. Let come to a boil again, then cook for 1 minute more. Turn off the heat and whisk in the butter. Pour the mixture over the sweet potatoes and sprinkle with 1/2 teaspoon salt and 1/4 teaspoon pepper.
Cover the dish with foil and roast until the potatoes are tender, about 30 minutes. Remove the foil and continue to roast until the sauce is reduced to a glaze, 10 to 15 minutes. Add the parsley, horseradish and 1/4 teaspoon salt and stir to coat the potatoes. Serve hot.
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