n n n In a large pot, melt butter. Add marshmallows and stir over low heat until marshmallows are completely melted.n n n n Stir in Fruity Pebbles until marshmallow is mixed throughout.n n n n Pour mixture onto a large piece of parchment paper and place another large piece on top. Roll out into a large rectangle, about 1/2-3/4 inch thick. I trimmed one side of the rectangle to make it even.n n n n Spread marshmallow fluff over the top.n n n n Gently roll the log up, rolling up the long side.n n n n Allow to completely cool and then cut log into slices.n nn