Measure 1/2 cup of the almond milk into a small bowl or large measuring cup. Add the vanilla protein powder and whisk vigorously until smooth and lump-free to create a protein slurry.
Pour the remaining 2 cups almond milk into a medium bowl. Stir in the Greek yogurt, maple syrup, vanilla extract, ground cinnamon, and a pinch of salt until evenly combined.
Add the protein slurry to the milk-yogurt mixture and whisk thoroughly. Once homogeneous, sprinkle in the chia seeds and fold them in with a rubber spatula so they distribute evenly.
Let the mixture sit at room temperature for 10 minutes, then stir vigorously or whisk again to break up any early clumps. This helps the seeds hydrate uniformly.
Divide the pudding among four 8-oz jars or bowls, cover, and refrigerate for at least 4 hours (or overnight) until fully set. For faster results, chill in the coldest part of your fridge and give each jar a quick stir after 30 minutes.
Before serving, top each portion with equal amounts of mixed berries and a sprinkle of chopped almonds or granola for crunch. If the pudding is too thick, stir in 1–2 tablespoons of milk to loosen.