Preheat the oven to 425°F. Line a rimmed baking sheet with foil or parchment paper, or spray it with nonstick spray.
In a small bowl combine the melted butter and the Frank’s Red Hot Sauce. Brush both sides of each cauliflower steak with the mixture, and place them on the prepared baking sheet. Roast for about 25 minutes, until the steaks are just tender, and browned in spots.