Add the oats, chia seeds, cream cheese, Greek yogurt, maple syrup, vanilla extract, and almond milk to a large mixing bowl. Whisk vigorously until smooth. Let thicken on the counter for 5-10 minutes.
If using frozen blueberries, heat them in the microwave for about 30 seconds in a microwave-safe bowl. Mash the blueberries with a fork until the consistency is jam-like.
Evenly distribute the oat mixture between 5 jars and layer the blueberries on top. Alternatively, mix the blueberries in with the other ingredients if you don't want to layer them.
Seal the jars with a lid or cover tightly with plastic wrap. Place in the refrigerator and let soak for at least 4 hours or overnight.
Once the oats have soaked up all the liquid, add toppings and enjoy. Serve cold or warmed for 30 seconds in the microwave.
