I have been searching for this same recipe. That's what I am doing right now. I have asked the bakery's and they tell me they get it that way already. I don't think the marshmallow creame is it because it is not fluffy enough and probably too sweet. It's more of a very fluffy whip cream (that doesn't melt away after sitting out for awhile). If you find it, please post it, and I will do the same.

Thanks