Slice the potatoes with a mandolin - using one of the thinnest settings. You want the slices to be slightly thicker than paper thin.
Arrange the potato and sweet potatoes on separate baking sheets lined with parchment paper. The regular potatoes tend to hold lots of water so dab them dry with a paper towel. Do the same with the sweet potatoes if you see moisture.
Once the potatoes are dry. Drizzle with the oil and salt. You can also use a variety of different seasonings. I also like Lawyr's seasoning and nutritional yeast on both types of chips. Once the salt and oil are added mix well with your hands so everything is evenly distributed.
Bake in a 425 degree oven for about 20-25 minutes. Mix the chips up halfway through and pay close attention so they don't burn. The sweet potato chips tend to take slightly longer than the other ones.
Once the chips are done baking sprinkle with a little more salt immediately. You can toss the regular chips with truffle salt if you have it and grate fresh Parmesan once they've cooled. This ia decadent treat - especially if you enjoy restaurant truffle fries!
You can serve the chips by themselves or with a simple dip of mayo and pesto or mayo and siricha for a kick.