Preheat the oven to 400°F (204°C), then line a rimmed baking sheet with parchment paper.
Add the cauliflower florets to a large bowl and toss them with olive oil, turmeric, salt, black pepper, and mustard powder.
Pour the cauliflower onto the prepared baking sheet in a single layer and roast them for 40-45 minutes, shaking them halfway through.
Notes
Nutrition Disclosure:
The nutritional information shown is an estimate provided by an online nutrition calculator. It should not be considered a substitute for professional advice.