Preheat the oven to 400° F.
Trim the rough tops and skinny bottom tips off of the okra pods, and cut the okra in half lengthwise. In a large bowl, toss the okra, salt, pepper, red pepper flakes, and olive oil together until well combined. On a rimmed baking sheet, spread the okra in a single layer and roast in the oven for about 15 to 20 minutes, or until brown. Serve immediately.