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Wash, peel, chop your potatoes and set into the Instant Pot.
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Add the water to the Instant Pot.
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Set the Instant Pot to Manual, High Pressure for 4 minutes.
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Once the cooking has completed, do a Quick Pressure Release.
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Once the pressure has been released open the pot.
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Mash the sweet potatoes inside your pot.
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Turn your instant pot to sauté.
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Add the milk, and butter to your sweet potatoes and mix to combine.
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Add the brown sugar and spices and mix to combine.
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Preheat your oven to a low broil.
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Continue to cook on sauté for five minutes while stirring often.
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Scoop the sweet potato casserole into a baking dish.
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Top your casserole with the remaining brown sugar.
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Sprinkle with mini marshmallow and chopped walnuts or pecans.
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Place the casserole dish onto the bottom rack of the oven.
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Bake in the oven for 3-6 minutes or until the marshmallows are toasted.
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Remove the potato casserole from the oven and serve warm.