01 - Preheat oven to 350°F. Generously grease a 12-cup mini muffin pan with butter or cooking spray.
02 - In a mixing bowl, combine flour and salt. Cut in cold cubed butter using a pastry cutter or fork until mixture resembles coarse crumbs. Sprinkle cold water over the mixture, 1 tablespoon at a time, tossing gently with a fork until dough holds together when pressed.
03 - Roll 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 up the sides.
04 - In a medium bowl, whisk together brown sugar, corn syrup, melted butter, egg, vanilla extract, and salt until completely smooth and well combined. Fold in chopped pecans until evenly distributed.
05 - Divide filling evenly among prepared crusts, using about 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 the pan for 10 minutes to set. Carefully run a small knife around the edges and lift out. Transfer to a wire rack to cool completely before serving. Optional: top with whipped cream.