In a large mixing bowl, whisk together 1 ½ cups of all-purpose flour, ½ cup of unsweetened cocoa powder, ⅓ cup of sugar, 2 teaspoons of baking powder, and a pinch of salt.

In a separate bowl, crack 2 eggs and whisk them until slightly frothy. Add 1 ½ cups of milk, ¼ cup of melted butter, and 1 teaspoon of vanilla extract and mix until well combined.

Pour the wet mixture into the bowl of dry ingredients and gently stir using a rubber spatula or wooden spoon.

Preheat your waffle iron according to the manufacturer's instructions, which typically takes about 5 minutes.

Lightly grease the waffle iron with non-stick spray or a small bit of melted butter on a paper towel.

Pour about ¾ cup of batter onto the center of the preheated waffle iron and cook for about 4-5 minutes, or until golden brown.

Carefully remove the waffles and serve warm, or keep them warm in a low oven if creating a larger batch.