Preheat your oven to 425°F and line a large baking sheet with parchment paper or foil.
Pat the broccoli florets completely dry with paper towels to remove any excess moisture.
In a large bowl, toss the broccoli with oil, minced garlic, salt, pepper, garlic powder, and red pepper flakes if using until evenly coated.
Spread the broccoli in a single layer on the baking sheet, making sure the florets have space between them for maximum crispiness.
Roast for 18-20 minutes until the edges are crispy and charred and the stems are tender when pierced with a fork.
Remove from the oven and serve immediately, optionally with a squeeze of fresh lemon juice.