Preheat oven to 375°. Line a large baking sheet with parchment paper.
On a lightly floured surface, unroll each piecrust. Using a 5-inch round cutter, cut 8 rounds from piecrusts, rerolling scraps once.
Dollop 2 tablespoons Blackberry Jam in center of each round. Brush cream around edge of rounds. Fold dough over filling, crimping edges with a fork to seal. Place pies on prepared pan. Cut 3 small vents in top of each pie to release steam. Brush each pie with remaining cream; sprinkle with turbinado sugar.
Bake until golden brown, 20 to 25 minutes. Let cool on pan.
Recipe by Taste of the South at https://tasteofthesouthmagazine.com/blackberry-hand-pies/