Preheat air fryer to 350°. Place first 4 ingredients in a small microwave-safe bowl; microwave on high 30 seconds., Toss Brussels sprouts with 2 tablespoons oil mixture. Place Brussels sprouts on tray in air-fryer basket; cook 4-5 minutes. Stir sprouts. Cook until sprouts are lightly browned and near desired tenderness, about 8 minutes longer, stirring halfway through cooking time., Toss bread crumbs with rosemary and remaining oil mixture; sprinkle over sprouts. Continue cooking until crumbs are browned and sprouts are tender, 3-5 minutes. Serve immediately.