Preheat the oven to 325°F. Set two racks in the upper and lower thirds.
Line two large baking sheets with parchment for easy release.
Slice the sweet potatoes very thin, about 1/16–1/8 inch, using a mandoline or sharp knife.
Soak slices in a bowl of cold water for 10 minutes to remove excess starch.
Drain and pat the slices completely dry with clean towels.
Toss slices with olive oil, salt, smoked paprika, garlic powder, and black pepper until evenly coated.
Arrange in a single layer on the prepared sheets without overlapping.
Bake for 15 minutes, then rotate pans and flip each slice. Bake 12–15 minutes more until edges curl and centers are dry.
Turn off the oven, crack the door, and let chips sit 5 minutes to finish crisping. Cool on the pans.