01 - Preheat oven to 350°F. Grease a 12-cup mini muffin pan thoroughly with cooking spray or butter.
02 - In a mixing bowl, combine flour and salt. Cut in cold butter using a pastry cutter or fingers until mixture resembles coarse crumbs. Gradually add cold water, 1 tablespoon at a time, mixing until dough just comes together into a ball.
03 - Roll out dough on lightly floured surface to 1/8-inch thickness. Cut twelve 3-inch circles using a round cookie cutter. Gently press each circle into the wells of the mini muffin tin, ensuring dough reaches up the sides.
04 - In a separate bowl, whisk together brown sugar, corn syrup, melted butter, egg, vanilla extract, and salt until completely smooth and well combined. Fold in chopped pecans.
05 - Spoon the pecan filling evenly into the prepared crusts, approximately 1 tablespoon per mini pie. Be careful not to overfill as the filling will expand slightly during baking.
06 - Bake for 22-25 minutes until the filling is set and no longer jiggles in the center, and the crust is golden brown.
07 - Allow pies to cool in the pan for 10 minutes before carefully removing. Transfer to a wire rack to cool completely. Serve plain or topped with whipped cream.