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Cut wax paper into 15x10-inch rectangle.
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Butter it.
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In large saucepan, melt peanut butter chips with 2/3 cup condensed milk over low heat.
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Let cool slightly.
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With your finger, press evenly in thin layer over wax paper.
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Leave at room temperature for 15 minutes.
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In pan, melt chocolate chips and other half of condensed milk.
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Remove from burner, add in vanilla extract.
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Stir.
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Evenly spread over peanut butter mixture.
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Leave at room temperature 1/2 hour.
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On 15-inch side of pan, roll up tight into jellyroll without wax paper.
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Wrap tightly in Saran wrap.
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Refrigerate for about 2 hours, or until firm.
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Cut into 1/4 inch slices!