Preheat the oven to 425°F (220°C)
Wash and dry the cauliflower
Remove the leaves and core
Cut the cauliflower into florets
Place the florets in a bowl
Add olive oil, salt, and pepper
Toss until evenly coated
Spread the cauliflower on a baking sheet in a single layer
Roast for 20 to 25 minutes
Flip halfway through cooking
Roast until tender and lightly browned
Serve immediately