01 - Preheat waffle iron according to manufacturer instructions.
02 - Whisk together flour, cocoa powder, sugar, baking powder, baking soda, and salt in a large bowl.
03 - Whisk buttermilk, eggs, melted butter, vanilla extract, and red food coloring in a separate bowl until well combined.
04 - Pour wet ingredients into dry ingredients and stir gently until just combined. Do not overmix; small lumps are acceptable.
05 - Lightly grease the preheated waffle iron with nonstick spray or melted butter.
06 - Pour 1/2 to 3/4 cup batter onto hot waffle iron. Close lid and cook for 3-5 minutes until crisp and cooked through.
07 - Repeat with remaining batter. Serve hot with butter and maple syrup.