Preheat the oven to 425° and line cookie sheets or a 9 x 13 baking dish with parchment.

Wash, and cut into 3/8" wide fries:

   - 2 lbs sweet potatoes

Put the potatoes into a medium bowl and rinse with cold water until the water runs clear. Drain water, refill bowl with fresh water, and allow potatoes to rest in the cold water for at least 10 minutes.

Drain the potatoes, pat them dry with a paper towel, and spray or drizzle with oil,.

In a small bowl, mix:

   - 3 Tbs cornstarch:

   - 1 tsp garlic powder

   - 1 tsp onion powder

   - 1 tsp salt

Add the seasonings to the potatoes, then spread the fries on the parchment paper.

Bake for 15 minutes, remove from oven, flip all fries with tongs, and put them back in the oven. Bake again until the fries are dry and slightly browned, about 16-19 more minutes. (Start checking at 10 minutes.)