Preheat oven to 350 degrees F.
In a large bowl combine flour, brown sugar, baking powder, salt, cinnamon, nutmeg, ginger, and pecans.
In another bowl, combine pumpkin, eggs, and vanilla, stirring well with a wire whisk. Add pumpkin mixture to flour mixture, stirring until dry ingredients are moistened.
The dough will be dry and crumbly.
Place dough on a lightly floured surface and knead lightly to incorporate all of the flour mixtures.
Divide into dough 4 portions.
Lightly flour hands and shape each portion into a log about 12 inches long.
Place logs 3″ apart on lightly greased or parchment-lined cookie sheets.
Bake for 20-25 minutes until lightly browned and firm to the touch.
Remove the cookie sheet from the oven and cool the logs for 15 minutes.
Reduce oven temperature to 300 degrees F.
Cut each log diagonally into 1/2″ slices using a serrated knife.
Place slices back on cookie sheets.
Bake for an additional 15 minutes.
Cool completely.
Enjoy!