Preheat oven to 375 degrees.

If you decide to make your own mini-pie shapes: on a surface covered with flour, roll out your pie crust. Cut out 2-inch circles (with a cookie cutter) of the rolled-out dough and place each pie circle in a muffin tin.

In a medium-sized bowl, mix blueberries, cornstarch, sugar, and lemon. Fill each pie crust with your blueberry mixture and dot it with butter.

Bake for about 15 to 18 minutes or until pie crust is golden. Be sure the pies are cool and set before taking them out of the muffin tin.