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Line a 8x8 square baking pan with parchment paper or foil (lightly grease if using foil).
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In a large saucepan over low heat, melt butter and marshmallows until smooth.
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Meanwhile stir together cereal and coarsely chopped cookies in a bowl. Add to melted marshmallows and stir quickly. Press into prepared pan and allow to cool.
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Remove from pan using edges of parchment or foil. Cut into 9 squares and then cut each square on a diagonal making a triangle.
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Melt chocolate chips and shortening together in microwave for 20 second increments. Stir each time, mine took 60 seconds before they were melted and smooth after stirring.
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Dip one side of the triangle shaped treat into the melted chocolate. Immediately dip in finely chopped cookies and set on parchment or waxed paper until set.
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Store in a covered container or large zip top baggie.