In a medium bowl, mix together dry ingredients: flour, sugar, baking powder, cocoa powder, and salt.
In a separate large bowl, add wet ingredients: eggs, buttermilk, vanilla extract, and butter. Whisk until smooth.
Add food color to the wet ingredients and stir until well blended.
Gradually whisk dry ingredients into the wet ingredients. Whisk until smooth and well combined.
Turn on mini waffle maker. When waffle maker indicates it is ready, pour approximately 1/4 cup of waffle batter into the bottom iron of the waffle maker. The batter will be thick so use a silicone spatula to spread evenly.
Close waffle iron and remove when waffle is cooked through (approximately 2-3 minutes). Continue with the remainder of the batter.
Serve warm with your favorite toppings.