Wash and hull the fresh strawberries, then dice them into small, bite-sized pieces.
In a wide-mouth glass jar or airtight container, combine the rolled oats, vanilla protein powder, chia seeds, and sea salt.
Whisk the dry ingredients together briefly to ensure the protein powder is evenly distributed and no clumps remain.
Add the Greek yogurt, unsweetened almond milk, and vanilla extract to the jar.
Stir the mixture vigorously until all the oats are submerged and the yogurt is fully integrated into the liquid.
Gently fold in three-quarters of the diced strawberries, saving the rest for a fresh topping later.
Seal the container with a lid and place it in the refrigerator for at least 4 hours, or preferably overnight, to allow the oats to soften and the chia seeds to gel.
Before serving, give the oats a quick stir and top with the remaining fresh strawberries.