Preheat the oven to 425F. Line a baking sheet with parchment paper and set aside.
Prep the potatoes:
Using a mandoline or slicer, THINLY slice the potato.
Use a paper towel to dry off the excess moisture from the slices. This is crucial to help them bake evenly and to crisp up.
Bake:
Coat the parchment-covered baking sheet with the cooking spray. Evenly spread out the potato slices in a single layer, then spray the tops as well.
Bake them for 18 to 20 minutes, until they begin to turn golden brown. Flip the slices about 11 to 12 minutes in.
Once you get close to 18 minutes, keep an eye on them because they will brown and crisp up QUICKLY. Some slices may cook faster than others. Remove those slices, if that happens to a few.
Season:
Once the potatoes reach your liking, remove the baking sheet from the oven and evenly sprinkle with the sea salt.
Store:
Store them in an airtight container for about 3 to 4 days, if you have any left!