Preheat the oven to 375°F (190°C) and line a cookie sheet with parchment paper.
Roll out the pie dough and cut 8 circles from each crust using a Mason jar lid or round cutter—8 for bases and 8 for tops.
Set aside the tops and cut out fun Halloween shapes like pumpkins, ghosts, or monster eyes with a small knife or cookie cutters.
Flip the Mason jar lids rubber side down and press a dough circle into each, spreading it evenly across the bottom and up the sides.
Spoon filling into each dough-lined lid, stopping just below the rim.
Cover with the spooky-faced tops, folding edges under to seal.
Crimp edges with fingers or a fork and brush tops with melted butter for a golden finish.
Bake for 25 minutes until golden and crisp.
Cool for 5–10 minutes, then gently push from the bottom of each lid to release the pies. Serve warm or at room temperature.