First you will need to prepare all of the ingredients before you put it together. Cook the sweet potatoes, cool and mashed in a bowl. Grind the walnuts in another bowl. Use 3-4 egg whites and froth them up. In another bowl, open the marshmallow bag and get ready to get 1 at a time. I would use deposable gloves. Once you get going with everything in front of you it will get messy!
Put a thin layer of oil in a flat oven pan. Get a large spoonful of potato. Add a marshmallow, covering all of it, then roll in egg white, then roll in walnuts. Add to the cooking pan.
Once pan is full, put in 325°F oven for 7-8 minutes depending on your oven. Watch closely until you know what your oven will do. You will see some bubbles then take out of oven!! This will be a big heat and look like a real pro in the kitchen.