My 4 1/2 year old calls it "Daddy Cereal". She loves it. We were at an Amish store over the weekend and they sell bags of just the marshmallows. That is like crack for her.
Thoma's Meat Market in Iowa City sells those Mennonite dehydrated marshmallows in their shop as well. I almost bought a bag for myself, but didn't want to start a new addiction right before the holidays.