Mix together cake mix, melted butter, and egg and pat into a 9x13 pan. Bake at 350 for 12 minutes. Take out and add 3 cups of small marshmallows. Return to oven and let them puff up. Watch closely.
Remove from oven. In kettle melt white karo syrup, butter, and peanut butter chips.
Then add salted peanuts and rice crispies. Spread evenly on top of the marshmallows.
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