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I used the cake recipe from here. And instead of using a 7 minute frosting or Italian Meringue like all the copy cat recipes say to use, we decided to go with real marshmallow. We didn't bother with the filling because I used regular muffin tins, so there wasn't much room or need for the filling. Frosting the little buggers was a complete pain because marshmallow goo is so sticky! But... they tasted oh-so-delicious. We used the rest of our marshmallow and toasted coconut to make normal marshmallows, and they were super-delish, too.
I'm thinking of attempting this in bar form to make it so much easier, yet equally delicious. I'll let you know if I do.