Use a knife and cutting board to remove the stem of the cauliflower head and chop it into florets.
In a large bowl, stir together the olive oil, turmeric, cumin, salt and pepper. Add the chopped cauliflower to the bowl, stirring to coat.
Spread the coated cauliflower onto a greased baking sheet and bake at 450 for 30 minutes, stirring halfway through cooking. Serve immediately once cooked.