Special equipment: a mandolin
Thinly slice the potatoes about 1/16-inch thick using a mandolin. Put the potato slices in a large bowl of cold water and stir to release the starch. Drain and refill the water as many times as necessary until the water remains clear. Line a baking sheet with paper towels. Transfer the potatoes to the paper towels and pat dry.
Line a large microwave-safe plate (the biggest that will fit in your microwave) with two layers of paper towel. Arrange as many potato slices on the paper towels as will fit in one layer without touching. Lightly brush the potatoes on both sides with oil and sprinkle lightly with salt. Microwave at full power for 3 minutes. Flip the slices over and microwave at 60-percent power until crispy and golden brown in spots, about 2 minutes more. Transfer the chips to a serving bowl and repeat with the remaining potatoes.