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.
After you slice the cauliflower into slabs at least 1-inch thick, you will have leftover bits from the sides. That is just fine. You can toss them with a bit of olive oil and salt and roast them right alongside, or if you have some of the Buffalo sauce mixture left, brush that on. They won’t be steaks, but they will be a well deserved and appreciated snack for the cook and for anyone lucky enough to be in the kitchen when the tray is removed from the oven.