Refrigerate the dough: Make sure you chill the dough before scooping the cookies. If your raw cookies are too warm they'll spread out too much on the cookie sheet.
Filling the cookies: You don't have to completely seal the marshmallow fluff filling in (unless you want to). It looks pretty when some swirls in the cookie dough and you can see it in the finished fluffernutter cookies.
Handle with care: The cookies will be quite soft when they come out of the oven but will firm up after a few minutes of cooling on the cookie sheet (and then they're no longer too fragile to transfer on to a cooling rack).
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