Preheat oven to 325 degrees and place 12 cupcake liners in a standard size cupcake pan.
Combine graham cracker crumbs, melted butter and salt in a bowl. Spoon graham cracker mixture evenly into the bottom of cupcake liners and press down lightly with your fingers to flatten. BAKE for 5 minutes or until browned.
In a medium bowl, beat together pumpkin, cream cheese, brown sugar, egg whites, and pumpkin pie spice until smooth. Spoon evenly into cups and bake for an additional 25 munutes or until set.
Let cool and serve at room temperature or chill and serve cool.