Heat the oil in a heavy-bottomed pot to 350 F. The oil should be at least 2 inches deep.
Using a knife, cut off the ends of the plantains and make long vertical slits along the peel.
Peel the plantains and slice them into paper-thin rounds (¹⁄₁₆ inch) using a mandoline for consistent thickness.
Pat the plantain slices completely dry with paper towels. Let them air dry for 5 minutes to remove excess moisture.
Working in small batches (don't overcrowd), carefully add the plantain slices to the hot oil. Fry them for 2-3 minutes until they're golden brown and crispy.
Remove the chips with a slotted spoon and immediately transfer them to a paper towel-lined plate to drain the excess oil.
While still warm, sprinkle the spices evenly over the chips and toss them gently to coat.
Cool the chips completely for maximum crispiness, for about 5-10 minutes.
Serve the plantain chips, and if you have any leftovers, store them in an airtight container.