Remove any loose or brown outer leaves from the Brussels sprouts. Trim the stem ends and slice each sprout in half through the stem so the cut side will caramelize evenly.
Pat the halved sprouts dry with a kitchen towel or paper towel — removing surface moisture helps them crisp in the air fryer.
In a large mixing bowl combine olive oil, minced garlic, salt, and black pepper. Add the halved sprouts and toss thoroughly so each piece is lightly coated with oil and garlic.
Preheat the air fryer to 375°F (190°C) for 3 minutes. Arrange sprouts in the basket in a single layer with the cut-side down if possible — do not overcrowd. Work in batches if required.
Air fry for 10–12 minutes, shaking or tossing the basket gently at the 6-minute mark. After the first cook, check for golden brown edges and crispness; if needed, cook an extra 2–3 minutes until desired char and tenderness are achieved.
When done, immediately transfer sprouts to the mixing bowl, sprinkle with grated parmesan and lemon zest (if using), and toss to coat so the cheese melts slightly from the residual heat.
Serve hot as a side with roast meats, pasta, or on their own as a snack.
Notes
🔹 Use small-to-medium sprouts for best caramelization; very large sprouts can be quartered.🔹 Don’t overcrowd the basket — air circulation is key for crispiness. Cook in batches if needed.🔹 For extra crispness spray a light coating of oil halfway through cooking.🔹 Add a pinch of chili flakes or smoked paprika for a smoky kick.🔹 To make dairy-free, skip parmesan and finish with toasted breadcrumbs and a squeeze of lemon.🔹 Store leftovers in an airtight container in the fridge for up to 3 days. Reheat in the air fryer at 350°F (175°C) for 3–5 minutes to refresh crispness.🔹 Serve with a drizzle of balsamic reduction or a sprinkle of toasted almonds for texture.