Preheat oven to 350°F (175°C) and grease a standard oven-safe ramekin.
Place rolled oats, protein powder, banana, milk, baking powder, and salt into a high-speed blender.
Process on high speed for 30 to 45 seconds until the batter is completely smooth and liquid.
Pour the batter into the prepared ramekin.
Bake for 20 to 25 minutes or until the top is firm to the touch and a toothpick inserted in the center comes out clean.
Remove from the oven and let cool for 5 minutes before serving.