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Preheat oven to 375 degrees.
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Place sweet potatoes in a sauce pan, cover with water and boil over medium heat until fork tender.
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Drain the potatoes and return them to the pot.
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Add your Greek yogurt and seasonings to the potatoes. Mix with a hand mixer.
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Add in melted butter and egg whites.
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Beat well.
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Transfer potatoes to a lightly greased, oven safe 9x13in casserole dish.
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Bake for 30 minutes.
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Remove from the oven and top with pecans and marshmallows.
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Return to the oven and bake for an additional 10 minutes or until marshmallows are lightly browned.
Notes:
*If you would like your casserole sweeter, feel free to add in ¼ cup brown sugar or coconut sugar. Please note this will change the macronutrients.