Preheat oven to 375°F.
Grease a 9 x 13 in baking dish and place cubed potatoes into the dish.
Combine milk, brown sugar, butter, vanilla, and spices in small saucepan.
Over medium heat, bring the mixture to a boil, whisking regularly.
Boil for 60 seconds.
Pour over potatoes and toss to coat.
Bake potatoes, uncovered, for about 50-60 minutes, gently stirring halfway through, or until potatoes are tender.
Remove from the oven and stir the potatoes again.
Season with more salt, if necessary.
Increase the temperature to 500°F.
Sprinkle potatoes with coconut and cashews.
Place marshmallows on top of that.
Return to oven and bake until marshmallows begin to brown, about 3 minutes.
Serve and enjoy!
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