In a big saucepan on the stove top, melt the butter and marshmallows together until completely melted. Stir in 5-6 cups of brown rice crispies. (I like to use about 5 Cups. I find they hold together better than if I use the full 6 cups.) Press into the bottom of a greased 9X13 pan. Refrigerate an hour or so until it cools.
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