Start by preheating your waffle iron as per the manufacturer's guidelines.
In a mixing bowl, blend together oat flour, protein powder, baking powder, and cocoa powder. Integrate honey, egg, milk, oil, and vanilla extract into the dry ingredients. Thoroughly whisk until you achieve a smooth, consistent batter.
Apply a light coating of cooking spray or a small amount of oil onto the waffle iron's surface. Pour an adequate amount of batter onto the preheated waffle iron, ensuring it covers the waffle grid entirely. Seal the waffle iron and follow the manufacturer's instructions for cooking, typically around 2-3 minutes, or until the waffles are fully cooked and release a delightful chocolatey fragrance.
Gently remove the waffles from the iron and set them on a wire rack to cool slightly. Enjoy your chocolate protein waffles warm, with freshly sliced strawberries, a spoonful of Greek yogurt, chopped nuts, and a drizzle of honey or maple syrup.