In a small bowl, combine 1/2 cup peanut butter, butter, confectioners' sugar and salt until smooth; set aside.
In a microwave, melt the chocolate chips, candy bars and remaining peanut butter; stir until smooth.
Drop teaspoonfuls of chocolate mixture into paper-lined miniature muffin cups. Top each with a scant teaspoonful of peanut butter mixture; top with another teaspoonful of chocolate mixture. Decorate with sprinkles if desired. Refrigerate until set. Store in an airtight container. Yield: 3 dozen.