This spicy roasted cauliflower is a quick and easy dish to make. When roasted, cauliflower tastes nutty and slightly sweet. In this spicy roasted cauliflower recipe, we toss cauliflower florets with a generous amount of ancho chili powder, smoked paprika, onion powder, garlic powder, salt, and cayenne pepper for some spice. For a spicy dish, add the full amount of cayenne, for milder palates, half the amount called for in the recipe.