Yield: 10 to 12 Simple blueberry hand pies are one of summer’s greatest treats, and they can hold up in the freezer as long as you make sure to mitigate some of the potential mishaps. A little bit of leakage is an expected delight; but in order to make sure there isn’t too much, this recipe calls for sprinkling the bottom of the pastry with a bit of flour, uses cornstarch in the filling, and encourages ripe, but still firm, berries.