In a wide-mouth glass jar or airtight container, combine the rolled oats, protein powder, and chia seeds.
Whisk the dry ingredients together to ensure the protein powder is evenly distributed and free of large clumps.
Incorporate the Greek yogurt, almond milk, maple syrup, and vanilla extract into the container.
Stir the mixture vigorously until the liquid is fully integrated and no dry pockets remain at the bottom of the jar.
Gently fold in three-quarters of the diced strawberries.
Secure the lid and refrigerate for a minimum of 6 hours to allow the oats and chia seeds to hydrate.
Garnish with the remaining strawberries immediately before serving.