01 - Preheat the 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 smooth and fully emulsified.
04 - Pour the wet mixture into the dry ingredients and stir gently until just combined. Avoid overmixing to keep the texture tender. Fold in the semi-sweet chocolate chips until evenly dispersed.
05 - Spoon approximately 1/2 cup of batter onto the center of the preheated waffle iron for each waffle, adjusting the amount based on your iron's size. Close the lid and cook for 4 to 5 minutes until the edges are crisp, the centers remain fudgy, and the waffles release easily.
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.