1. Preheat the oven to 375 degrees Fahrenheit.
2. Rinse and slice the yams very thinly (about 1/8 inch).
3. Line two or three REAL metal (very important) cookie sheets with Gefen Easy Baking Parchment Paper (disposable pans will produce soft chips that don’t crisp up; parchment paper helps absorb moisture in baking and keeps chips from sticking to the pan) and lay out the yams in a single layer leaving a bit of space between each one – make sure none are overlapping. Spray with oil and season with salt.
4. Bake for 30 minutes and then remove any slices that look baked completely, as some parts will bake faster than others. Flip the rest and continue to bake until desired crispness is reached.