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This easy sweet potato casserole is a holiday classic of mashed sweet potatoes flavored with cinnamon and brown sugar, topped with toasted marshmallows.
Gather all ingredients.
Place sweet potatoes in a large pot and cover with salted water; bring to a boil.
Reduce heat to medium-low and simmer until tender, about 20 minutes; drain.
Preheat the oven to 375 degrees F (190 degrees C). Grease a deep casserole dish.
Mash potatoes with a potato masher in a bowl until no large lumps remain.
Stir in both sugars, cinnamon, and butter until well combined.
Transfer sweet potato mixture to the prepared casserole dish. Cover with a layer of miniature marshmallows.
Bake in the preheated oven until marshmallows are browned, about 30 minutes.