Preheat oven to 375 degrees.
Toss the sweet potatoes, butter, brown sugar, salt, cinnamon & nutmeg together in a large bowl.
Add the mixture to a baking dish and cover with foil pan.
Allow to cook for 30 minutes.
Uncover and stir sweet potatoes gently.
Cook an additional 20 minutes uncovered.
Top with marshmallows and broil for up to 30 seconds, to allow the marshmallows to brown.
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