Soak the chia seeds: In a large bowl or jar, stir the chia seeds into the non-dairy milk. Let sit for 5 minutes, then stir again well to prevent clumping. Cover and refrigerate for at least 2 hours or overnight until thickened.
Prep the add-ins: On a cutting board, finely chop the dates, pistachios, and pumpkin seeds.
Combine: Stir the chopped dates, pistachios, and pumpkin seeds into the chia mixture. Add the yogurt, hemp hearts, vanilla extract, cinnamon, and blueberries. Mix well, adding more nondairy milk until the desired texture is reached.
Adjust: Add more sweetener or vanilla to taste.
