Make the overnight oats: Combine milk, yogurt, syrup and salt. Whisk until well blended. Fold in oatmeal, carrots, raisins and chia seeds until well combined. Cover. Refrigerate 2 hours or overnight.
To make parfait: Layer overnight oats in bottom of container. Sprinkle with granola and nuts. Add more overnight oats. Garnish parfait with nuts, raisins, shredded carrots and a drizzle of maple syrup if desired.
Serve parfaits cold or cover and refrigerate until needed.