01 - Preheat your waffle iron according to the manufacturer's instructions.
02 - In a large bowl, whisk together the flour, cocoa powder, sugar, baking powder, baking soda, and salt.
03 - In a separate bowl, beat the eggs. Add milk, melted butter, and vanilla extract; mix until well combined.
04 - Pour the wet ingredients into the dry ingredients and stir gently until just combined. Do not overmix—the batter should be slightly lumpy.
05 - Fold in the chocolate chips if using.
06 - Lightly grease the waffle iron with nonstick spray or melted butter.
07 - Pour enough batter into the center of the waffle iron to just cover the grid. Close and cook until the waffle is crisp and cooked through (about 4–5 minutes).
08 - Repeat with the remaining batter.
09 - Serve warm, topped with berries, whipped cream, and a drizzle of maple syrup or chocolate sauce.