Is marshmallow "fluff" a different product than marshmallow "creme"? I found this online ... Marshmallow Fluff is still produced by the same batch process developed over 75 years ago - it's the only marshmallow creme made in this manner. I've never seen fluff in the stores here.
Nah, fluff and creme are the same thing. To fill cupcakes, I use an apple corer. I drive the corer right down to the bottom of the cupcake while twisting, and then I pull out the "plug." (Sometimes I have to dig a bit if it comes out in pieces). Don't worry about a hole in the bottom of the cupcake because some of the cake gets flattened down on the bottom. I do this to each cupcake and lay the plug beside it. Then I put the filling in a sealable plastic food bag. I cut a corner off the bottom of the bag and stuff the bag into each cupcake hole and squeeze in my filling. I squeeze without moving the bag until I see the filling rise up to the bag, and then I slowly bring the bag up while still squeezing until the hole is almost filled. Then I stop squeezing and take the bag out. Then I take just the tippy top of the plug and put it back on the cake unless the filling is going to be the same as the frosting, in which case I don't bother to cover the hole. It sounds like a lot of work, but it really only takes 5 or 10 minutes, and the results are GREAT! Lots of filling! Yum! 
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