Preheat oven to 375 degrees. Arrange potatoes on a baking sheet. Drizzle oil over all of them and coat them evenly using your hands. Sprinkle on ½ teaspoon salt to both sides of the potatoes. Place into preheated oven and baked for 1 hour to 1 hour 15 minutes, depending on the size of the potato. Larger ones will take longer to bake.
Once cooked, remove potatoes from the oven. Cut each potato in half and gently split them. Using a spoon, scoop out most of the filling into a large bowl, leaving a small edge of filling to help keep the skins firm and sturdy. Add remaining salt, butter, maple syrup, cream cheese, and spices to bowl. Using a potato masher, mash the ingredients together until smooth.
Scoop the filling into each potato skin until full. Top each marshmallow halves until the top is completely covered, about 6-8 halves. Place back into oven and bake until marshmallows have started to brown, about 5-7 minutes.
Remove from the oven and serve immediately.