Make the chia pudding: In a medium bowl, whisk together the yogurt, milk, maple syrup, vanilla extract, and salt until smooth. Stir in the chia seeds until well combined.
Let it thicken: Let the mixture sit for 5 minutes, then stir again to prevent clumping. Cover and refrigerate for at least 4 hours, or overnight, until thick and creamy.
Prepare the berry layer: Mash the berries with the honey or maple syrup and lemon juice, if using. Stir in the chia seeds and let sit for 10–15 minutes until thick and jam-like.
Assemble the jars: Divide half of the chia pudding between 2 jars. Spoon the berry mixture over the top, then add the remaining chia pudding if you’d like layered jars.
Serve or store: Enjoy right away or cover and refrigerate for up to 4 days.
Notes
Use full-fat Greek yogurt for the thickest, creamiest texture.
If the pudding becomes too thick, stir in a splash of milk before serving.
Add crunchy toppings just before eating so they stay crisp.