Measure Rice Krispies in a large bowl and set aside. Butter bottom and sides of a 9x13-inch pan and set aside. Melt together marshamallows and butter. When melted, pour over over the Rice Krispies and mix well. Press firmly into the pan. Remove from heat and add 3/4 cup peanut butter. Mix well and spread over Rice Krispies and cool. When cool, frost with frosting.
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