Once tender, drain the potatoes and add them back to the pot. Using a potato masher, mash the potatoes until there are no big lumps. Then, add remaining ingredients (minus the marshmallows) and combine all ingredients until fully incorporated.
1 cup Whole Milk, 1 stick Salted Butter, ¼ cup Brown Sugar, ½ teaspoon Kosher Salt, 1 teaspoon Cinnamon, ¼ teaspoon Ground Nutmeg, ¼ teaspoon Ground Clove, ¼ cup Maple Syrup, ½ teaspoon Vanilla Extract