In a bowl, combine oats, milk, 1 tablespoon maple syrup, vanilla, chia seeds, and salt. Stir well.
In a small saucepan, heat berries and remaining 1 tablespoon maple syrup over medium heat until berries break down (about 3 minutes).
Mash berries with a fork and stir in lemon juice. Let cool slightly.
Divide half the oat mixture between two jars or containers.
Add a layer of berry mixture, then top with remaining oats.
Use a knife to gently swirl the berry mixture into the oats.
Cover and refrigerate overnight or for at least 4 hours.
Before serving, top with fresh berries.
