01 - Preheat the waffle iron according to the manufacturer's instructions.
02 - In a large bowl, whisk together flour, cocoa powder, sugar, baking powder, baking soda, and salt.
03 - In a separate bowl, beat eggs. Add milk, melted butter, and vanilla extract; mix until well combined.
04 - Pour wet ingredients into dry ingredients and stir gently until just combined, keeping the batter slightly lumpy to avoid overmixing.
05 - Gently fold in chocolate chips, if using.
06 - Lightly grease the waffle iron with nonstick spray or melted butter.
07 - Pour batter onto the center of the waffle iron to cover the grid. Close and cook until waffles are crisp and cooked through, approximately 4 to 5 minutes.
08 - Repeat cooking with remaining batter. Serve warm topped with fresh berries, whipped cream, and a drizzle of maple syrup or chocolate sauce.