In a large bowl combine milk, chia seeds, syrup and 2 tablespoons peanut butter. Stir in oats. Cover and refrigerate (or transfer to individual bowls/glasses/jars). Refrigerate overnight, until the oats are tender and the mixture is creamy. For serving: Swirl in a little extra peanut butter (optional), then top the oats with sliced bananas. You can also add an extra drizzle of syrup or honey.