Preheat oven to 350°F (175°C) and lightly grease a standard 8-ounce oven-safe ramekin.
Combine rolled oats, banana, protein powder, milk, baking powder, vanilla extract, and salt in a high-speed blender.
Process until the batter is completely smooth and resembles a thick pancake batter.
Stir in half of the diced strawberries by hand using a spatula.
Transfer the batter into the prepared ramekin and distribute the remaining strawberries on the surface.
Bake for 20 to 25 minutes until the center is firm and the edges have slightly pulled away from the sides.
Remove from the oven and allow to rest for 5 minutes before consuming.