01 - Preheat oven to 350°F. Grease a 12-cup mini muffin pan with butter or cooking spray.
02 - In a medium bowl, whisk together flour and salt. Cut in cold butter using a pastry blender or fork until mixture resembles coarse crumbs. Gradually add cold water, 1 tablespoon at a time, mixing until dough just comes together.
03 - Roll out dough on a 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 the dough reaches the bottom and sides.
04 - In a separate bowl, whisk together brown sugar, corn syrup, melted butter, egg, vanilla, and salt until completely smooth and well combined. Stir in chopped pecans until evenly distributed.
05 - Spoon the pecan filling evenly into the prepared crusts, approximately 1 tablespoon per mini pie. The filling should come nearly to the top of each crust.
06 - Bake for 22-25 minutes, or until the filling is set and no longer jiggles in the center, and the crust is golden brown.
07 - Let the pies 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 if desired.