Scrub the potatoes clean (and peel them, if desired).
Using a sharp knife, slice the potatoes into very thin rounds. The thinner the better. You may have better luck getting very thin slices with a vegetable peeler or a mandolin slicer (if you have fancy kitchen equipment on hand).
Spray a microwave-safe casserole dish with cooking spray and lay the potatoes on it in a single layer.
Sprinkle potatoes with salt, to taste.
Microwave on high for 6 to 8 minutes, until chips are crisp.
Remove from microwave and repeat with remaining chips.