Preheat: First, preheat your oven to 400°F (200°C).
Prep: Wash broccoli and pat dry. Cut into even-sized florets.
Season: Place broccoli on a baking sheet. Drizzle with olive oil. Add the sliced garlic, salt, pepper, and red pepper flakes. Toss well to coat.
Arrange: Spread the broccoli out so the pieces aren't crowded.
Roast: Bake for 15-20 minutes, tossing halfway through, until the edges are crispy and brown.
Finish: Remove from oven. Immediately drizzle with fresh lemon juice and sprinkle with parmesan cheese. Toss again and serve hot.