01 - Preheat oven to 350°F. Grease a 12-cup mini muffin pan with cooking spray or butter.
02 - In a mixing bowl, combine flour and salt. Cut in cold butter using a pastry blender or two forks until mixture resembles coarse crumbs. Gradually add cold water, 1 tablespoon at a time, mixing until dough just comes together. Form into a disk, wrap, and refrigerate for 10 minutes.
03 - Roll out dough on lightly floured surface to 1/8-inch thickness. Cut twelve 3-inch circles using a round cutter or glass. Gently press each circle into the wells of the mini muffin tin, ensuring even coverage up the sides.
04 - In a medium 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 filling evenly into prepared crusts, approximately 1 tablespoon per mini pie. Bake for 22-25 minutes until filling is set and crusts are golden brown. The centers should still have a slight jiggle.
06 - Let pies cool in pan for 10 minutes to set. Carefully run a thin knife around edges and remove to wire rack. Cool completely before serving. Optional: top with whipped cream.