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 fork until mixture resembles coarse crumbs. Sprinkle with cold water, 1 tablespoon at a time, mixing gently until dough holds together when pressed.
03 - Roll dough on lightly floured surface to 1/8-inch thickness. Cut twelve 3-inch circles using a round cutter or glass. Press circles into muffin cups, easing dough into bottoms and up sides.
04 - Whisk brown sugar, corn syrup, melted butter, egg, vanilla, and salt until completely smooth. Fold in chopped pecans until evenly distributed.
05 - Divide filling evenly among crusts, about 1 tablespoon each. Bake 22 to 25 minutes until filling is set and crusts are golden brown.
06 - Let cool in pan 10 minutes. Carefully loosen edges and remove to wire rack. Cool completely before serving. Top with whipped cream if desired.