Preheat air fryer to 350degrees. Place first four ingredients in a small microwave-safe bowl; microwave on high 30 seconds., Toss Brussels sprouts with 2 tablespoons oil mixture. Place all the Brussels sprouts in air fryer basket and cook 4-5 minutes. Stir sprouts. Continue to air fry, stirring every 4-5 minutes, until sprouts are nearing desired tenderness and are lightly browned, about 8 minutes longer., 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.