Preheat the oven to 450 degrees. Peel the kohlrabi and cut it into 1-inch wedges. Place it in a bowl and mix it with the olive oil, cayenne, and salt.
Spread out the kohlrabi on a rimmed baking sheet and roast it for about a half-hour, stirring every ten minutes, until it’s golden brown and tender when pierced with a fork. Toss the kohlrabi with the parmesan and parsley, and serve. Enjoy!