01 - Preheat oven to 350°F. Grease a 12-cup mini muffin pan thoroughly with butter or cooking spray.
02 - In a mixing bowl, combine flour and salt. Cut in cold cubed butter using a pastry blender or fingers 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 covers the bottom and sides evenly.
04 - In a separate bowl, whisk together brown sugar, corn syrup, melted butter, egg, vanilla, and salt until completely smooth. Fold in chopped pecans until evenly distributed.
05 - Spoon the pecan filling evenly into the prepared crusts, approximately 1 tablespoon per mini pie. Be careful not to overfill as the filling will expand slightly during baking.
06 - Bake for 22-25 minutes, or until the filling is set and the crust edges are golden brown. The centers should still have a slight jiggle but not be liquid.
07 - Let cool in the pan for 10 minutes to set. Carefully run a knife around the edges and remove each pie to a wire rack. Cool completely before serving. Optionally top with whipped cream.