In a medium-sized bowl, add the chia seeds, oats, and pumpkin seeds. Stir to combine.

Pour in the water, Greek yogurt, maple syrup, and cinnamon. Stir until everything is well combined.

Gently fold in the blueberries until evenly mixed.

Transfer the mixture to an airtight container. Store in the refrigerator for at least 12 hours or up to 2 days.