Preheat the oven to 350 degrees conventional/ 325 convection.
In the mixer bowl- combine the flour, salt, sugars, baking powder, and spice - mix with the paddle for about 30 seconds.
In a large measuring cup - add the pumpkin puree, eggs, and vanilla - mix well.
Add the wet mixture to the dry mixture & beat well.
The mixture should be very thick - not like cake batter.
Add additional flour if needed - up to 1 cup- it should be quite firm & hold it's shape.
Beat in the caramel bits.
Divide the dough into 2-3 portions, and place it on a parchment-lined baking sheet. Shape each portion into a log.
Bake for 28-30 minutes.
Remove & allow them to cool for about 15 minutes.
Slice into 3/4" pieces, and lay them flat on the baking sheet.
Bake for an additional 8-10 minutes.
Remove, and flip each piece over, and return them to the oven to bake a final 8-10 minutes.
Allow them to cool on the baking sheet before storing in an airtight container.