Preheat oven and prep the spices. Preheat oven to 425 degrees Fahrenheit. In a small bowl combine turmeric, cumin, paprika, mustard powder, cayenne or chili flakes if using, salt, and black pepper.
Roast cauliflower. Transfer to the oven and bake, flipping halfway through, for about 18-22 minutes, until cauliflower pieces are tender and nice and crispy.