Poke sweet potatoes all around with fork, and bake on baking sheet for 60 minutes.
After potatoes are soft, remove from oven and slice vertically.
Scoop out insides of sweet potatoes, leaving about 1/4 inch of potato around the edges.
Place the potato insides in a bowl.
Combine cream cheese, cinnamon, and potato insides in a bowl until well mixed.
Scoop cream cheese mixture into potatoes filling the hollow inside.
Top with pecans and marshmallows.
Put potatoes back in oven for about 10 minutes until cooked through, and marshmallows are golden.
Serve immediately.
Notes
To make these the day before:You could get them to the point of refilling the potato skins. Stick in the fridge and then bake later. You may need to bake a little longer to heat through since the filling will have been chilled from being in the fridge. Then top with the marshmallows and pecans for the last 10 minutes of baking.