Preheat your oven to 200°C (390°F). Place a rimmed baking sheet inside to warm up.
Wash and thoroughly dry the broccoli, then cut it into evenly sized bite-sized florets for uniform roasting.
Peel the garlic cloves and slice them thinly or crush them with the side of a knife to help release their sweet aroma.
In a small bowl, combine the olive oil with the sliced garlic, a pinch of salt, and chili flakes if using. Mix well to coat the garlic evenly.
Toss the broccoli florets in the garlic-oil mixture until they are well coated, then spread them out evenly on the hot baking sheet.
Slide the baking sheet into the oven and roast for about 20-25 minutes, shaking or tossing halfway through to ensure even caramelization.
Watch for the edges of the broccoli to turn golden and crispy, and the garlic to become fragrant and caramelized — the garlic should be soft and slightly browned.
Remove from the oven and let sit for a couple of minutes. Squeeze fresh lemon juice over the top or add lemon zest for brightness if desired.
Finish with a light sprinkle of sea salt or chili flakes, then serve warm, enjoying the tender, crispy bites infused with sweet roasted garlic aroma.