Combine Brussels sprouts, apples, cranberries and half the crumbled bacon. In a small bowl, whisk vinegar, syrup, oil, salt and pepper; pour over Brussels sprouts mixture, tossing to coat. Transfer to a 6-qt. electric pressure cooker. Lock lid; close pressure-release valve. Adjust to pressure-cook on high for 3 minutes. Quick-release pressure. To serve, sprinkle with hazelnuts and remaining bacon.