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Preheat the oven to 350 degrees F (180C) and line a 9x11 inch (or 8x8) baking pan with parchment or wax paper.
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Stir together the peanut butter, maple, salt, and vanilla in a medium bowl. Add in the cereal and stir to coat evenly. Scrape the mixture into prepared pan and press down with a flat spatula or the bottom of a cup to flatten. Bake for 10 -12 minutes until browned and bubbling.
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Remove the pan from oven and cool for about 15 minutes until no longer hot to the touch. Cover pan with plastic and place in the freezer to chill for at least 30 minutes.
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In a double-boiler, melt the chocolate chips over low heat and stir until melted and smooth. Add 1 tablespoon peanut butter and stir well. Scrape the chocolate on top of the bars and use a rubber spatula to smooth over the top. Place pan back in freezer for a few minutes to harden chocolate.
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Once set, remove bars from pan and use a sharp knife to cut into bars