Preheat the oven to 400 degrees F. Line two baking sheets with parchment paper or wire racks.
Trim the ends of the plantains. Score the skin lengthwise in three spots and peel. With a mandoline or sharp knife, slice the plantains crosswise about 1/8-inch thick.
Arrange the plantain slices on the prepared baking sheets and spray generously with coconut oil spray. Season with 1/2 tablespoon of the jerk seasoning and 1/2 teaspoon of the salt. Turn over the slices and repeat with coconut oil spray and the remaining 1/2 tablespoon jerk seasoning and 1/2 teaspoon salt.
Bake for 10 minutes, then spray the tops of the plantains a second time with coconut oil spray. Rotate the baking sheets from top to bottom and continue baking until the plantains are golden and crisp, another 10 to 15 minutes. Cool on the baking sheets before serving.