01 - Preheat oven to 350°F. Grease a 12-cup mini muffin pan thoroughly with cooking spray or butter.
02 - Combine flour and salt in a mixing bowl. Cut in cold butter using a pastry blender or fingers until mixture resembles coarse crumbs. Add cold water 1 tablespoon at a time, mixing just until dough holds together when pinched.
03 - Roll dough on lightly floured surface to 1/8-inch thickness. Cut twelve 3-inch circles using a cookie cutter. Press circles gently into mini muffin cups, ensuring dough reaches up the sides.
04 - Whisk brown sugar, corn syrup, melted butter, egg, vanilla, and salt in medium bowl until completely smooth. Stir in chopped pecans until evenly distributed.
05 - Spoon approximately 1 tablespoon of pecan filling into each prepared crust, filling nearly to the top but not overflowing.
06 - Bake for 22-25 minutes until filling is set and crusts are golden brown. The centers should still have a slight jiggle but not be liquid.
07 - Let pies cool in pan for 10 minutes before carefully removing. Transfer to wire rack to cool completely. Serve plain or topped with whipped cream.