Preheat your oven to 425°F (220°C) and line a baking sheet with parchment paper.

In a large mixing bowl, combine the cauliflower florets with olive oil, garlic powder, salt, and black pepper. Toss until evenly coated.

Spread the seasoned cauliflower florets in a single layer on the prepared baking sheet.

Roast the cauliflower for 20 minutes; check for doneness.

Sprinkle the grated Parmesan cheese over the cauliflower and return it to the oven for an additional 10 minutes.

After adding the Parmesan, roast for another 10 minutes until golden brown.

Transfer to a serving platter and drizzle with basil pesto.

Garnish with lemon zest, pine nuts, and chopped parsley before serving.