2 Tbsp olive oil
1/4 tsp sea salt
Preheat oven to 250 degrees and place oven rack in the center of the oven.
Rinse and dry your yams and slice them as uniformly thin as possible. If you have a mandolin, use it.
Toss slices in a touch of olive oil to lightly coat, then sprinkle with salt. Lay out in a single layer on parchment paper and gently transfer the sheets directly onto the oven racks.
Bake for about 2 hours, flipping chips after one hour to ensure even cooking.
Remove once crisp and golden brown. Let them rest for 10-15 minutes to crisp up. Serve immediately.
Adapted from: http://minimalistbaker.com/baked-sweet-potato-chips/