Preheat oven to 400 degrees.

Mix together cornstarch, sugar, lemon and cinnamon and toss with blueberries to coat.

Line pie plate with pie crust and fill with blueberry mixture.

Cover pie with the other half of a crust (if using pate brisee, or the second crust if using Trader Joe's) or use a paring knife to cut strips to weave a lattice; seal and crimp edges firmly.

Place a sheet of foil in the bottom of the oven (to catch berry juices that may leak out of pie during baking).

Bake for 35 minutes, then reduce heat to 375 degrees and bake for 15-20 more minutes.

Remove and set on a wire rack to cool at least 1 hour, until juices are set.

Serve with vanilla ice cream.