Baked sweet potato french fries (chips) too soft, how to crispen? My first ever stab at french fries, and 20 minutes with olive oil and seasonings in the oven preheated at 450*F was not enough to make them crisp. They were cut thick.

Could I simply cook them longer to dry them up? They have the texture and consistency of a baked potato.... except the skins are crisp
You can try a few things:


dredge the fries in cornstarch (whack them in a plastic bag, give it a good shake), shake off the excess, then season.
ensure the fries are in a single layer in the pan - crowding and stacking will mean they steam, not roast
when they're nearly done, turn the oven off and leave them in there for 20 minutes or so before serving.


I would also avoid cutting them thick. They should be french fries, not steak fries.