Preheat the oven to 400°F.

Line a large baking sheet with parchment paper.

Make sure the broccoli florets are roughly 1 inch wide, and arrange in an even layer on the baking sheet.

Drizzle the broccoli with olive oil. Sprinkle with salt, black pepper, and garlic powder.

Use a rubber spatula to toss the broccoli until it is evenly coated in the oil.

Cut the lemon in quarters and squeeze the juice over the broccoli florets. Arrange the slices on the pan among the broccoli.

Roast on middle rack of oven for 15 minutes.

Open the oven and sprinkle the Parmesan cheese over the broccoli. Toss lightly with a rubber spatula. Continue roasting until cheese is lightly golden and the broccoli is crisp-tender, 8-10 minutes.

Check to see that broccoli is done. Remove from oven or add time as needed.

Discard the lemon wedges, and serve immediately.