Bake the sweet potatoes skin on at 350° for about an hour, until they are easily pierced by a sharp knife. You can do this a day or more ahead.
Let them cool and then peel them and mash them. I use a food mill, but you can mash them any way you like.
Preheat the oven to 350 degrees F. Butter a 2-quart casserole dish and set
aside.
Add the evaporated milk, brown sugar, butter, vanilla, cinnamon, beaten eggs, salt and pepper, to taste. Mix together until smooth.
Pour the mixture into the casserole dish and bake for 25 minutes
Remove the casserole dish from oven and top with the cashews, coconut, and then marshmallows.
The estimated measurements for the cashews, coconut, and marshmallows might not be correct because it depends on the dimensions of the
casserole dish. Just make sure you cover the casserole adequately with the toppings.
Bake until the marshmallows are lightly toasted, about 5 to 10 more minutes.
Remove the casserole from the oven and let cool for 5 minutes before
serving