Start by washing and thoroughly drying the broccoli florets. Moisture is the enemy of crispiness, so make sure they are completely dry. Cut them into evenly sized pieces for consistent cooking.
Place the florets in a large bowl and drizzle with olive oil. Add salt, garlic powder, and black pepper, then toss well to coat evenly. This step ensures every bite is flavorful and well-seasoned.
Spread the broccoli on a parchment-lined baking sheet in a single layer. Avoid overcrowding, as this can cause steaming instead of roasting. Give each piece enough space to crisp up properly.
Bake in a preheated oven at 220°C (425°F) for 20–25 minutes. Flip halfway through to ensure even browning. The edges should turn golden and crispy while the inside remains tender.
Once out of the oven, immediately sprinkle crushed nori over the hot broccoli. Toss gently so the heat helps the seaweed stick. Add a drizzle of sesame oil if desired for extra flavor.