In a small bowl or mason jar, add oats, chia seeds, and salt, and stir to combine. Then add milk, yogurt, honey, and vanilla extract, and stir again until well combined with the oats.
Once well combined, add blueberries and lemon zest and gently stir them into the oat mixture.
Cover the bowl or jar with a lid and transfer to the fridge overnight or for at least 2 hours.
In the morning, take the oats out of the fridge, give them a stir, top with additional topping as desired, and enjoy!
If making them for meal prep, the oats can be made in advance and stored in an airtight container in the fridge for up to 5 days.