Preheat the oven to 425°F (220°C). Line a baking sheet with parchment paper if you want easy cleanup.
Prep the Brussels sprouts: trim the stems and cut in half lengthwise. If you have very large sprouts, quarter them for even roasting.
Toss the sprouts in a large bowl with olive oil, salt, and black pepper until evenly coated.
Spread sprouts cut-side down on the baking sheet in a single layer. This is key for crispy edges.
Roast for 18–22 minutes, flipping once halfway through, until deeply golden and crisp on the outside and tender inside.
While they roast, make the glaze: in a small saucepan over low heat, combine honey, minced garlic, soy sauce, vinegar, and red pepper flakes (if using). Warm for 1–2 minutes, stirring, just until glossy and fragrant don’t boil hard.
Transfer roasted sprouts to a bowl (or toss right on the sheet pan if you prefer). Drizzle the warm honey garlic glaze over and toss until every sprout is coated.
Taste and finish with a pinch of flaky sea salt if you like. Serve warm while they’re at peak crispiness.