Preheat your oven to 350°F and lightly grease a small oven-safe ramekin or baking dish with a touch of coconut oil.
In a medium mixing bowl, whisk together the liquid egg whites, non-fat Greek yogurt, vanilla extract, and maple syrup until the mixture is smooth and well combined.
Add the rolled oats, chia seeds, baking powder, ground cinnamon, and sea salt to the wet ingredients, stirring until the oats are fully submerged.
Gently fold in half of the mixed berries, taking care not to crush them.
Pour the mixture into the prepared baking dish and scatter the remaining berries across the top.
Bake for 25 to 30 minutes, or until the center is set and the edges are slightly golden and pulling away from the dish.
Remove from the oven and let it sit for 5 minutes to cool slightly before enjoying warm.