
Preheat the oven to 425°F and line a large baking sheet with parchment paper.
Break the cauliflower into bite-sized florets. Toss with olive oil, salt, and pepper and spread evenly onto the baking sheet. Roast for 25 to 35 minutes, or until browned around the edges.
Season to taste. If desired, toss with the lemon zest, parsley, and/or grated parmesan, and serve.