In a small bowl, combine the oats, chia seeds, yogurt and milk. Stir well.
Mix in the lemon zest and blueberries.
Cover and store the fridge for at least 1 hour (preferably overnight).
When ready to eat, stir in the walnuts and enjoy!
Notes
Add-ins (optional):
To add a little bit of crunch and protein: top with sliced almonds, chopped walnuts, hemp seeds or extra chia seeds
For extra creaminess: use a higher fat percentage Greek yogurt or milk
If you need some extra sweetness: drizzle a bit of maple syrup, honey or your choice of sweetener. Alternatively, you could also use a flavoured Greek yogurt. There are many brands that offer lemon-flavoured yogurt, which would allow you to skip the zest altogether.
To save time and energy: make a double or triple batch in a large bowl and just scoop and go in the morning. Work smarter, not harder!