Preheat your oven to 375°F and lightly grease a small oven-safe baking dish or large ramekin with a touch of coconut oil or avocado oil spray.
In a medium mixing bowl, whisk together the dry ingredients: rolled oats, vanilla protein powder, ground cinnamon, sea salt, and baking powder.
Add the wet ingredients to the bowl, including the egg whites, unsweetened almond milk, and vanilla extract, stirring until the mixture is well combined.
Gently fold in the fresh blueberries, taking care not to burst them so the batter stays clean.
Pour the oatmeal mixture into the prepared baking dish and spread it into an even layer.
Sprinkle the sliced almonds across the top to create a uniform crust.
Bake for 20 to 25 minutes, or until the center is firm to the touch and the almonds have reached a golden, toasted brown.
Remove from the oven and let cool for 5 minutes before serving warm.