Preheat the oven to 375 degrees F. Line a large baking sheet with parchment paper.
Cut the ends off the plantain and score the peels from end to end, making sure not to cut through the plantains. Pull the peels off and discard.
Slice the plantains on an angle to make longer pieces, 1/4- to 1/3-inch thick.
Place the plantain slices on the baking sheet and drizzle with oil. Toss to coat all the plantain slices on both sides. Lay them out in a single layer. Then sprinkle with salt.
Bake the plantains for 10 minutes. Then flip and bake another 10 minutes. Season with salt and serve warm.
Notes
**If plantains are green at the store put them in a brown paper bag on the counter for a day or two.