In a small bowl combine the sugars, PB, butter and vanilla; cover
and set aside. In microwave-safe bowl, melt chocolate chips and
shortening. Pour teaspoonfuls into paper-lined muffin cups.
Drop a rounded teaspoonfuls of peanut butter mixture into each
cup; top with another teaspoonful of chocolate mixture.
Refrigerate until set. Store in airtight container.
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