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Preheat oven to 350 degrees F. Line a cookie sheet with a Sil-Pat (or parchment paper).
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In a medium bowl, combine flour, salt, baking soda, baking powder, and pumpkin pie spice; set aside.
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In a large bowl, cream together butter and sugars. Add egg, vanilla, and pumpkin; mix until well blended and smooth.
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Add flour mixture to pumpkin mixture in two additions, mixing until just combined after each addition. Stir in Butterfingers.
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Portion cookie dough by the tablespoonful onto prepared cookie sheet. Bake 10 to 12 minutes.
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Remove from oven and cool 2 minutes on cookie sheet. Transfer cookies to cooling rack and rest for 10 minutes. Cookies with be light and cakey.