Fill electric fryer with oil. Heat to 375°F; this will take approximately 15 to 20 minutes.
While oil heats, cream the butter and sugar with an electric mixer. Beat in syrup, flour, salt, and vanilla extract. Stir in pecans until well mixed.
Unroll pie crusts and cut into 16 circles using a 4 inch cookie cutter (or a glass mug that is wide enough). This requires re-rolling twice using the leftover crust. Spoon 1 tablespoon of filling in the center of each crust circle. Fold dough in half, creating a half-moon shape. Seal and crimp the open edges using the tines of a fork.
Fry the pies in batches of two at 350°F for 3 minutes until golden brown, turning occasionally to brown evenly. Remove pies and place on paper towels to drain. Let cool slightly and dust with confectioners' sugar if desired.