Preheat oven to 350℉.
Peel the plantains and slice thinly into rounds, diagonal oblongs, or full length slices.
Toss or brush with oil and arrange in a single layer on baking sheets lined with parchment paper. Sprinkle with salt.
Bake until lightly browned and crisp, 20 - 30 minutes depending on shape and thickness.
Cool for 10 minutes on paper towels.