01 - Preheat oven to 350°F. Grease a 12-cup mini muffin pan thoroughly.
02 - Combine flour and salt in a bowl. Cut in cold butter using a pastry blender or fingers until the mixture resembles coarse crumbs. Gradually add cold water, mixing until the dough just comes together.
03 - Roll out the dough on a lightly floured surface. Cut twelve 3-inch circles and gently press each into the wells of the mini muffin tin.
04 - Whisk together brown sugar, corn syrup, melted butter, egg, vanilla, and salt until smooth. Stir in the chopped pecans.
05 - Spoon the filling evenly into the prepared crusts, about 1 tablespoon per pie.
06 - Bake for 22 to 25 minutes, or until the filling is set and the crust is golden brown.
07 - Cool in the pan for 10 minutes, then carefully remove and transfer to a wire rack to cool completely. Serve plain or with a dollop of whipped cream.