Place rice krispies in a large bowl. Place butter, corn syrup and brown sugar in large saucepan. Melt and stir over medium heat. Bring to a boil and boil for 3 minutes. Stir in sweetened condensed milk. Return mixture just to a boil. Pour over rice krispies. Mix completely. Press into a large, greased cookie sheet. Allow to cool before cutting. This makes a big batch!
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