Halve brussels sprouts. Line in a single layer on a baking sheet, and drizzle olive oil over sprouts. Sprinkle the chili flakes and half the salt over the veggies.
Roast 16-18 minutes until the sprouts have golden, crispy edges and to your desired level of doneness.
Remove brussels sprouts from the oven, and sprinkle with the remaining salt.
Add brussels sprouts to a serving bowl, drizzle the vinegar and optional syrup over the sprouts, and toss to incorporate. Serve immediately.
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Notes
Nutrition information is calculated without the optional maple syrup.