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In a large stand mixer, beat softened butter with brown sugar until fully combined.
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Add vanilla and peanut butter, beat until fluffy.
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Add flour and sweetened condensed milk.
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Beat until everything is blended well. Fold in the chocolate chip morsels.
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Press into an 8" x 8" tin foil baking tray.
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Melt the chocolate chips add peanut butter in a double boiler or bowl on top of boiling water.
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Melt for and mix until fully combined.
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Pour over the cookie dough and spread evenly.
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Refrigerate for 3 hours (or overnight). Cut into square pieces.
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Serve and enjoy!