Heat oven to 400 degrees. Cut 1-2 sheets of parchment paper into 5-by-5-inch squares. Line each cup of 12-cup muffin pan with one square of parchment paper.
Roll out pie crust and cut out 12 circles, 2 inches each, with cookie cutter. Press each circle into lined muffin cup.
In medium bowl, combine sweetener, blueberries and chocolate. Divide mixture among pie crusts.
Bake for 17 minutes until chocolate melts. Allow to cool, and serve.