Step 1: Preheat Your Waffle Iron. Start by preheating your waffle iron according to the manufacturer's instructions.
Step 2: Combine Dry Ingredients. In a large mixing bowl, whisk together the all-purpose flour, granulated sugar, baking powder, ground cinnamon, and salt.
Step 3: Prepare the Wet Ingredients. In another bowl, separate the egg yolks from the whites. Add the melted butter, milk, and vanilla extract to the bowl with the egg yolks.
Step 4: Mix Together. Pour the wet mixture into the dry ingredients and gently stir until just combined.
Step 5: Beat the Egg Whites. In a clean bowl, beat the egg whites until stiff peaks form.
Step 6: Fold in the Egg Whites. Carefully fold the beaten egg whites into the batter.
Step 7: Cook the Waffles. Lightly grease your preheated waffle iron and pour the appropriate amount of batter onto the iron, cooking until golden brown.
Step 8: Serve and Enjoy! Remove the waffles from the iron and serve immediately with your favorite toppings.