01 - Preheat your waffle iron according to the manufacturer's instructions. Lightly grease the plates if needed to prevent sticking.
02 - In a large mixing bowl, whisk together the all-purpose flour, unsweetened cocoa powder, granulated sugar, baking powder, and salt until evenly distributed and no lumps remain.
03 - In a separate bowl, whisk the eggs, melted butter, whole milk, and pure vanilla extract until the mixture is completely smooth and well blended.
04 - Pour the wet ingredients into the dry mixture and stir gently until just combined. Avoid overmixing. Fold in the semi-sweet chocolate chips until evenly distributed throughout the batter.
05 - Spoon approximately 1/2 cup of the thick batter onto the center of the preheated waffle iron for each waffle. Close the lid and cook for 4 to 5 minutes, until the edges are crisp and the centers remain fudgy and set.
06 - Carefully remove each waffle from the iron using a spatula. Serve warm on their own or topped with ice cream, whipped cream, fresh berries, or a dusting of powdered sugar.