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Mix the rice krispies and peanuts together in a large bowl.
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Line a 9"x 13" pan with parchment paper (leaving enough of an overhang to remove the bars later).
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In a medium sauce pan on medium heat combine the peanut butter, brown sugar and corn syrup. Warm until everything is melted and combined.
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Pour over the cereal and peanuts and stir quickly to evenly coat everything.
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Transfer mixture to the parchment lined pan and pressing firmly and evenly into pan.
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Melt 2 cups of Semi-sweet chocolate chips (using either a bain-marie or microwave method).
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Spread the melted chocolate evenly over the bars in the pan.
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Then sprinkle generously with flakey sea salt or fleur de sel.
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Also the bars to set at room tempature for 2 -3 hours or to speed up the process 40 -60 minutes in the fridge.
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Do not cut until the chocolate begins to harden. I find it best to cut while the chocolate is cool and firm, but not completely hardened yet.
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So once sufficiently cooled, use the parchment paper sides to remove the bars to a large cutting board.
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Cut into pieces (approximately about 1" x 2" is my preference).