Preheat the oven to 350°F (175°C) and grease a standard oven-safe ramekin or small baking dish with non-stick spray.
Place the oats, protein powder, baking powder, salt, lemon zest, lemon juice, almond milk, egg, and maple syrup into a high-speed blender.
Blend on high for 20-30 seconds until the mixture reaches a smooth, liquid consistency.
Pour the batter into the prepared ramekin.
Gently stir in the fresh blueberries, ensuring they are evenly distributed.
Bake for 22 to 25 minutes, or until the center is set and the edges are lightly golden brown.
Allow the oats to cool for 5 minutes before serving to let the internal structure set.