Preheat your oven to 220°C (430°F). Line a large baking sheet with parchment paper for easy cleanup.
Cut the broccoli into chunky, bite-sized florets, keeping some stems if tender. Place them in a mixing bowl.
Add the minced garlic, olive oil, salt, and red pepper flakes to the bowl. Toss everything together until the broccoli is evenly coated with oil and seasonings. The garlic will become fragrant as you toss.
Spread the coated broccoli in a single layer on the prepared baking sheet, making sure to give each piece some space for crispy edges.
Roast in the oven for 15 minutes, until the garlic turns golden and fragrant, and the broccoli begins to blister and caramelize around the edges.
Gently toss the broccoli with tongs or a spatula to redistribute the oil and garlic bits, then roast for another 10 minutes. The edges should be darkened and crispy, with a smoky aroma filling the kitchen.
Remove from oven and immediately squeeze fresh lemon juice over the hot broccoli to brighten the smoky flavors. If using, sprinkle with Parmesan cheese for extra flavor and a cheesy touch.
Let the broccoli rest for a couple of minutes, then serve warm, enjoying the crispy, caramelized edges and fragrant garlic aroma. Finish with an extra squeeze of lemon if desired.