In a mixing bowl, combine corn syrup, brown sugar, eggs, vanilla extract, salt, cinnamon, and melted butter. Whisk together until well mixed. Stir in the pecan halves until evenly coated. Set aside.
Roll out the pie crusts on a floured surface using a rolling pin. Cut out 8 rounds using a pie cutter or round cookie cutter, about 5 inches in diameter.
Heat vegetable oil in a deep frying pan or deep fryer to 350°F (175°C).
Place a tablespoon of the pecan filling in the center of each crust round. Fold the round in half to form a half-moon shape and seal the edges by crimping with a fork or pressing them together with your fingers.
Once the oil is hot, carefully add the pies in batches, being mindful not to overcrowd the pan. Fry for about 3-4 minutes on each side or until golden brown. Use a slotted spoon to remove them from the oil and transfer to a wire rack to cool.
If desired, dust the cooled pies with powdered sugar before serving.