Blend or mash: In a blender, combine the banana, eggs, rolled oats, protein powder, peanut butter, baking powder, cinnamon, vanilla, salt, and 2 tablespoons milk. Blend until smooth.
If you don’t have a blender, mash the banana well, whisk in eggs and peanut butter, then stir in oat flour and remaining ingredients.
Adjust the batter: You’re aiming for a pourable but thick batter. Add a splash more milk if it’s too thick, or a spoon of oats if it’s too thin. The batter should ribbon off a spoon, not run like water.
Preheat the pan: Heat a nonstick skillet or griddle over medium heat. Add a small pat of butter or a light drizzle of oil and swirl to coat.
Pour and shape: Scoop about 1/4 cup of batter per pancake.
Keep them small to medium so they cook through easily.
Cook until bubbly: Let the pancakes cook 2–3 minutes, until you see bubbles on top and the edges look set. Resist the urge to turn too early.
Flip gently: Flip and cook another 1–2 minutes until golden and cooked through. Turn the heat down slightly if they brown too quickly.
Repeat and serve: Continue with the remaining batter, lightly greasing the pan as needed. Serve warm with sliced banana, a drizzle of peanut butter, and a little maple syrup.