Preheat your oven to 425°F (220°C) and line a baking sheet with parchment paper.
In a large mixing bowl, combine the halved Brussels sprouts with the olive oil. Season with salt, black pepper, and red pepper flakes, then toss to coat.
Spread the Brussels sprouts on the prepared baking sheet in a single layer, cut side down. Roast for 20-25 minutes until golden brown and crispy.
In a small saucepan over medium heat, combine the honey, minced garlic, and apple cider vinegar. Stir frequently and simmer for 3-5 minutes until thickened, then remove from heat.
Transfer the roasted Brussels sprouts to a large bowl, pour the honey garlic sauce over them, and toss gently to coat.
Return the coated Brussels sprouts to the baking sheet and bake for an additional 5 minutes for extra crispiness.
Allow to cool slightly before serving, garnished with sesame seeds and freshly chopped parsley.
Notes
For an extra kick, add red pepper flakes to the seasoning.