01 - Preheat oven to 350°F. Grease a 12-cup mini muffin pan thoroughly with cooking spray or butter.
02 - In a medium bowl, whisk together flour and salt. Add cold cubed butter and use a pastry cutter or fingers to work it in until mixture resembles coarse crumbs. Sprinkle with 2-3 tablespoons cold water, one tablespoon at a time, mixing gently until dough just holds together when pressed.
03 - Roll dough on lightly floured surface to 1/8-inch thickness. Cut twelve 3-inch circles using a round cookie cutter or glass. Gently press each circle into the wells of the mini muffin tin, pressing up the sides slightly.
04 - In a separate bowl, whisk together brown sugar, corn syrup, melted butter, egg, vanilla extract, and salt until completely smooth. Fold in chopped pecans until evenly distributed.
05 - Spoon about 1 tablespoon of filling into each prepared crust. Bake for 22-25 minutes until filling is set and crusts are golden brown.
06 - Let cool in pan for 10 minutes before carefully removing. Transfer to wire rack to cool completely. Serve plain or topped with whipped cream.