In a 16-ounce mason jar or sealable container, combine the rolled oats, protein powder, and chia seeds.

Whisk the dry ingredients briefly to ensure the protein powder is evenly distributed.

Add the Greek yogurt, almond milk, and vanilla extract to the jar.

Stir the mixture vigorously until the yogurt and protein powder are fully integrated into the liquid.

Gently fold in the fresh blueberries using a spoon to avoid crushing the fruit.

Seal the container with a lid and refrigerate for a minimum of 6 hours or overnight.

Remove from the refrigerator and stir before serving to redistribute moisture.