In a blender, combine the rolled oats, chocolate protein powder, cocoa powder, baking powder, and salt. Blend until the oats are a fine flour.
Add the almond milk, maple syrup (if using), and vanilla extract to the blender. Blend until smooth and well combined.
Preheat your waffle iron and lightly grease it with cooking spray or oil.
Pour the batter into the preheated waffle iron, using about 1/2 cup of batter for each waffle (adjust based on your waffle iron's size). Close the lid and cook according to the manufacturer's instructions, usually about 4-5 minutes.
Carefully remove the waffles and repeat with the remaining batter.
Serve warm with your favorite toppings, such as fresh fruit, nut butter, or a drizzle of chocolate syrup.